Abyssal Plain / Season 1, Episode 3
Black Echoes
Episode 3: Black Echoes
The submersible shuddered, a bone-deep tremor that rattled Elena’s teeth as she gripped the control panel. Depth: 9,512 meters. The sonar screen flickered, static slashing across the display before the massive shape reappeared, a ghostly outline too vast to comprehend, lingering at the edge of detection. Outside, the abyss pressed against the reinforced glass, an endless black that swallowed the sub’s floodlights like a hungry mouth. The air inside smelled of sweat and burnt wiring, the faint tang of fear clinging to every breath. The hum—God, that hum—pulsed through the hull, a low, relentless throb that seemed to come from everywhere and nowhere, burrowing into her skull.
“Elena, talk to me,” Marcus snapped from the comms station, his voice tight, fingers flying over the keyboard as he tried to stabilize the sonar feed. His dark eyes flicked to the screen, then back to her, searching for something—reassurance, maybe. She didn’t have it to give. “Is that thing still out there?”
“It’s not going anywhere,” she muttered, her gaze locked on the glass. Beyond the lights, the shapes—the smaller ones—darted in and out of view, their bioluminescent streaks flashing like dying embers in the dark. They weren’t attacking, not yet, but their presence felt like a warning, a tightening noose. “Sonar’s picking up the big one at… shit, it’s closer now. Maybe two hundred meters off port.”
“Closer?” Marcus’s voice cracked, just for a second, before he swallowed it down. “How the hell is it moving that fast at this depth? Pressure should’ve crushed anything that size.”
“Tell that to whatever’s out there,” Elena shot back, her hands trembling as she adjusted the thrusters to hold their descent steady. The sub groaned under the strain, metal creaking like it might split apart any second. She could feel the weight of the ocean, all 9,500 meters of it, pressing down on them, a physical ache in her chest. “Rory, you got anything on the acoustic readings? That hum’s getting worse.”
Rory, hunched over the audio panel in the cramped rear compartment, didn’t look up. His headphones pressed tight against his ears, his freckled face pale under the harsh overhead lights. “It’s not just a hum anymore,” he said, voice low, almost a whisper. “There’s… structure to it. Patterns. Like it’s trying to communicate.”
“Communicate?” Marcus barked a laugh, sharp and bitter. “What, you think it’s singing us a lullaby? It’s probably just interference, Rory. Currents, mineral deposits, something messing with the signal.”
“No,” Rory said, firmer now, pulling off the headphones and rubbing his temples. “I’ve filtered out the background noise. This isn’t random. It’s repeating. Same sequence, over and over. Almost like… a code.”
Elena’s stomach twisted. She didn’t want to think about what that meant. Not now, not here, with the abyss staring back at them through the glass. “Can you decode it?” she asked, forcing her voice to stay even.
“Not without more data,” Rory admitted, his fingers drumming nervously on the panel. “But I’m recording everything. If we can get a longer sample—”
A sharp jolt rocked the sub, cutting him off. The lights flickered, plunging the cabin into darkness for a heartbeat before the backups kicked in, bathing them in a sickly red glow. Elena’s breath caught as a low, grinding screech echoed through the hull, like claws raking across steel. The sonar beeped frantically, the massive shape now less than a hundred meters away, its outline sharpening into something jagged, uneven, not a creature but… something else.
“What the fuck was that?” Marcus hissed, his hands frozen on the controls.
“Impact,” Elena said, her voice barely above a whisper. She leaned forward, peering into the black, her heart hammering against her ribs. The floodlights caught a glint—something metallic, a flicker of unnatural sheen in the murk. Not organic. Not a creature. “That’s not alive. It’s… it’s a structure. Something man-made.”
“Down here?” Marcus’s disbelief was palpable, his brow furrowing as he stared at the sonar. “That’s impossible. No one’s been this deep. Not with tech like that.”
“Unless someone has,” Rory muttered, his voice heavy with implication. He didn’t elaborate, but the weight of his words hung in the air, thick and suffocating.
Elena didn’t respond. She couldn’t. Her mind raced, piecing together fragments—government black ops, cold war experiments, things buried in the deep where no one would ever find them. But that didn’t explain the hum. Or the shapes outside, circling like vultures. She adjusted the floodlights, tilting them toward the glint, and for a moment, she saw it—a jagged edge, a piece of hull maybe, encrusted with sediment but unmistakably artificial. Then it was gone, swallowed by the dark as the sub drifted downward.
“We need to get closer,” she said, her jaw tight. “If that’s a wreck, it might have answers. About what’s down here. About why we’re being followed.”
“Are you out of your mind?” Marcus snapped, spinning in his chair to face her. “We’re already pushing the sub past its limits. Hull integrity’s at eighty-two percent. We get any closer to… whatever that is, and we might not come back up.”
“We don’t have a choice,” Elena shot back, her voice hard. “We’re not alone down here. Those things out there, they’re not random. They’re guarding something. And I’m not turning back until I know what.”
Marcus opened his mouth to argue, but another jolt silenced him, this one harder, the sub lurching to starboard. A warning light flashed on the panel—thruster failure, port side. Elena cursed under her breath, fighting to stabilize their descent, the controls sluggish under her hands. The hum spiked again, louder, drilling into her ears, and for a split second, she swore she heard something in it—a whisper, a word she couldn’t quite catch.
“Rory, shut that damn thing off!” she barked, her nerves fraying at the edges.
“I can’t!” he shouted back, his hands shaking as he adjusted the audio filters. “It’s not coming through the system anymore. It’s… it’s in the hull. Vibrating through the metal. Like it’s inside with us.”
The cabin went quiet, the only sound the creak of the sub and the relentless hum, now a physical thing, a pressure against her eardrums. Elena’s skin crawled. She glanced at Marcus, then at Rory, their faces pale in the red light, eyes wide with the kind of fear that didn’t need words. Outside, the shapes flickered closer, their glow pulsing in time with the hum, a sickening rhythm that felt like a countdown.
“Hold steady,” she said, more to herself than to them, as she nudged the sub forward, toward the glint in the dark. “We’re going in.”
The descent felt slower now, each meter a battle against the crushing weight of the ocean. The sub’s lights cut through the black, revealing nothing but swirling sediment and the occasional flash of bioluminescence from the creatures outside. Elena’s hands stayed locked on the controls, her knuckles white, her breath shallow. The hum hadn’t stopped, but it had changed—deeper now, almost mournful, threading through the cabin like a dirge. She tried to ignore it, focusing on the sonar, on the shape that loomed closer with every passing second.
“Depth: 9,520 meters,” Marcus read out, his voice flat, mechanical, like he was reciting numbers to keep himself grounded. “Hull integrity at seventy-nine percent. If we take another hit—”
“We won’t,” Elena cut him off, though she didn’t believe it. She couldn’t afford to. “Rory, talk to me. What’s the hum doing now?”
Rory didn’t answer right away. He was hunched over the audio panel again, headphones back on, his face a mask of concentration. When he finally spoke, his voice was distant, almost hollow. “It’s… evolving. The patterns are shifting. Faster now. Like it’s reacting to us moving closer.”
“Reacting?” Marcus turned, his eyes narrowing. “You’re saying it knows we’re here?”
“I’m saying it’s not static,” Rory replied, his tone clipped. “I don’t know what it knows. But the closer we get to that structure, the more complex the signal becomes. It’s almost… excited.”
Elena’s grip tightened on the controls. Excited wasn’t a word she wanted to hear down here, not about something they couldn’t see, couldn’t understand. She tilted the floodlights again, sweeping them across the void, and this time, the glint held—a sharp, angular edge jutting out of the sediment, half-buried in the ocean floor. It was massive, easily the size of a small ship, its surface pitted and scarred, covered in a crust of mineral deposits that shimmered faintly under the light. No coral, no barnacles, nothing living. Just cold, dead metal, older than anything she’d ever seen.
“That’s no natural formation,” Marcus said, leaning forward, his voice low. “Look at the lines. Too straight, too precise. That’s engineered.”
“No kidding,” Elena muttered, her eyes tracing the outline. It wasn’t just a piece of hull—it was part of something larger, a fragment of a whole she couldn’t yet grasp. The sonar beeped again, the massive shape now directly ahead, less than fifty meters off. Her pulse quickened. “I’m taking us in for a better look. Rory, keep recording. Marcus, get the external cameras rolling. I want every angle.”
“You’re gonna get us killed,” Marcus grumbled, but he complied, flipping switches to activate the high-res cams mounted on the sub’s exterior. The screens above the control panel flickered to life, showing grainy, washed-out images of the structure as the sub crept closer. The hum pulsed harder, faster, a staccato beat that matched the flickering of the shapes outside, their glow now a near-constant strobe in the dark.
Elena’s breath hitched as the cameras zoomed in. The metal wasn’t just old—it was alien in its design, with sharp, geometric patterns etched into its surface, lines and angles that didn’t match any human engineering she’d ever seen. No rivets, no seams, just smooth, interlocking plates that seemed to shimmer under the light, almost liquid in their texture. At the edge of the frame, something caught her eye—a marking, a symbol carved deep into the metal, a spiral with jagged, branching arms, like a fractured star.
“What the hell is that?” she whispered, more to herself than anyone else.
Marcus didn’t answer. He was staring at the screen, his face drained of color, his hands hovering over the controls as if he’d forgotten how to move. Rory, though, leaned closer, his eyes wide, almost hungry. “That’s not… that’s not from any culture I know,” he said, his voice trembling with something between fear and awe. “It’s not human. Not even close.”
“Stop it,” Marcus snapped, breaking the silence. “We don’t know what it is. Could be some lost prototype, some military experiment gone wrong. Doesn’t mean it’s… whatever you’re thinking.”
But Elena wasn’t so sure. The hum, the shapes, the symbol—it all felt wrong, like they’d stumbled into a place they were never meant to be. Her fingers hesitated on the controls, the sub hovering just meters from the structure now, the floodlights casting long, distorted shadows across its surface. The air in the cabin felt heavier, thicker, the smell of burnt wiring sharper now, stinging her nose.
“Elena,” Rory said suddenly, his voice urgent. “The hum—it’s peaking. Loudest it’s been. And the shapes outside, they’re… they’re swarming. Coming in fast.”
Her head snapped to the glass. He was right. The bioluminescent streaks were no longer flickering in the distance—they were closing in, dozens of them, their glow a blinding pulse that lit up the abyss in jagged bursts. They moved with purpose, darting toward the sub, their forms still indistinct but larger now, more defined, with tendrils or limbs or something reaching out as they approached.
“Thrusters, now!” Marcus shouted, slamming his hand on the panel to override her controls. The sub lurched backward, the groan of metal echoing through the cabin as the engines strained against the current. But the shapes were faster, their glow filling the glass, a wall of light and shadow that made Elena’s stomach drop.
“Hold on!” she yelled, fighting to regain control, her hands slick with sweat. The hum was unbearable now, a scream in her ears, vibrating through her bones. The sonar beeped wildly, the massive structure still ahead, unmoving, but the smaller shapes were everywhere, surrounding them, their light pulsing in perfect sync with the sound.
And then, through the chaos, she saw it—on the camera feed, a flicker of movement across the structure’s surface. Not sediment, not shadow. Something sliding open, a panel or a hatch, revealing a faint, greenish glow from within. Her breath stopped. It wasn’t dead. It wasn’t a wreck.
It was active.
[To be continued in the second half of Episode 3]
Elena’s heart slammed against her ribs, each beat echoing the relentless hum that now felt like a living thing inside the submersible. Depth: 9,525 meters. The greenish glow from the structure pulsed faintly on the camera feed, a sickly light that seeped through the dark like a wound in the abyss. Whatever that panel or hatch was, it hadn’t been opened by chance. Something—or someone—had triggered it. Her hands froze on the controls, the sub hovering in the crushing black, caught between the glowing shapes swarming outside and the ancient, impossible thing ahead.
“Elena, we need to move!” Marcus’s voice cut through the haze, sharp and raw, his fingers already working the override to push the thrusters harder. Sweat beaded on his forehead, glistening under the red emergency lights, his breath coming in short, ragged bursts. “Those things are gonna ram us if we don’t—”
“I see it,” she snapped, her gaze flicking between the glass and the camera feed. The shapes outside were closer now, their bioluminescent streaks forming a tightening ring around the sub, their forms still maddeningly indistinct—part shadow, part substance, with tendrils or spines that seemed to shift and writhe with every pulse of light. The hum screamed louder, a jagged edge to it now, like a voice breaking under strain. Her ears throbbed, her vision blurring at the edges.
“Rory, what’s the hum doing?” she barked, forcing her voice to stay steady even as her insides churned. “Is it tied to that… that glow?”
Rory didn’t answer right away. He was slumped over the audio panel, headphones pressed tight against his ears, his face a mask of pale, clammy fear. His fingers trembled as he adjusted dials, the screen in front of him flickering with waveforms that spiked and dipped in erratic patterns. “It’s… it’s off the charts,” he finally said, his voice barely audible over the noise. “The frequency’s jumping. It’s not just a signal anymore. It’s… it’s like a command. Telling something to wake up.”
“Wake up?” Marcus spun in his chair, his eyes wide, the whites stark against his dark skin. “You’re losing it, man. That’s not—”
Another jolt rocked the sub, cutting him off, the impact hard enough to throw Elena against her harness. A metallic screech tore through the cabin, nails on a chalkboard amplified a thousand times, as something scraped along the hull. The warning lights flashed—hull integrity down to seventy-five percent. Her stomach dropped. One more hit like that, and the ocean would claim them, crushing the sub like a tin can under a boot.
“Cameras!” she shouted, her voice cracking as she fought to stabilize their position. “Marcus, get me a visual on whatever hit us!”
He didn’t argue this time, his hands flying over the controls to swivel the external cams. The screens flickered, static slashing across the feed before an image snapped into focus. Elena’s breath caught. One of the shapes—closer than ever—hovered just meters from the hull, its form finally visible in the floodlights. It wasn’t a fish, not a squid, not anything she could name. Its body, if you could call it that, was a mass of translucent, gelatinous tissue, shot through with veins of glowing blue light. Tendrils—dozens of them—extended from its core, each tipped with something sharp, metallic, glinting like polished obsidian. It didn’t move like a creature. It moved like a machine, precise and deliberate, its tendrils coiling as if preparing to strike again.
“What the fuck is that?” Marcus whispered, his voice barely a breath, his hands frozen on the panel.
Elena couldn’t answer. Her mind reeled, grappling with the impossible. Organic, but not. Mechanical, but alive. The hum pulsed harder, syncing with the creature’s glow, and for a moment, she swore its tendrils twitched in rhythm, like it was listening. Waiting.
“Elena,” Rory said suddenly, his tone urgent, almost frantic. “The glow from the structure—it’s intensifying. And the hum… it’s not just coming from outside anymore. It’s… it’s resonating with something in here.”
“In here?” She turned, her pulse spiking, her eyes darting around the cramped cabin. The air felt charged now, electric, the smell of burnt wiring sharper, mingling with the metallic tang of fear. “What do you mean, in here?”
Rory didn’t look at her. His gaze was locked on the audio screen, his fingers trembling as he pointed to a secondary waveform, smaller but distinct, layered over the main signal. “There’s a feedback loop. Something in the sub is picking up the signal and… amplifying it. It’s like we’re part of the circuit now.”
Her blood ran cold. She glanced at the control panel, at the flickering lights and buzzing dials, then at the walls of the sub itself, the reinforced titanium that suddenly felt far too thin. The hum wasn’t just outside. It was inside, vibrating through the metal, through her bones, a presence she couldn’t escape. Another scrape against the hull snapped her back, the creature outside dragging its tendrils along the port side, a slow, deliberate taunt. The sonar beeped—more shapes closing in, a dozen at least, their signals overlapping in a chaotic swarm.
“We can’t stay here,” Marcus said, his voice low, urgent, his hands already prepping the thrusters for full reverse. “We need to ascend. Now. Before those things tear us apart.”
“And go where?” Elena shot back, her jaw tight, her mind racing. “We’re nine and a half kilometers down. Ascent takes hours. They’ll follow us. And that structure…” She gestured to the camera feed, where the greenish glow pulsed brighter, almost blinding now, illuminating more of the jagged, alien design. “It’s active. It’s doing something. We turn back now, we’ll never know what.”
“Know what?” Marcus’s voice rose, raw with frustration. “That we’re gonna die down here? That’s what you wanna know? We’re not equipped for this, Elena. This isn’t science anymore. This is suicide.”
She didn’t answer. She couldn’t. Because deep down, she knew he was right. Every instinct screamed at her to flee, to hit the emergency ballast and rocket back to the surface, consequences be damned. But the structure—the symbol, the glow, the hum—it pulled at her, a hook in her gut she couldn’t shake. Answers were down here, answers to questions she hadn’t even known to ask. And those creatures, whatever they were, weren’t attacking to kill. Not yet. They were herding. Guiding.
“Rory,” she said, her voice quieter now, but firm. “Can you isolate that feedback loop? Figure out what’s picking up the signal?”
He hesitated, his fingers hovering over the panel, his freckled face slick with sweat. “I… I can try. But it’s risky. If I boost the internal sensors to pinpoint it, it might amplify the hum even more. Could overload the system.”
“Do it,” she said, not breaking eye contact with the camera feed. The structure loomed larger now, its surface crawling with faint, shimmering patterns, like circuitry etched into the metal, activated by the glow. “We need to know.”
Rory nodded, swallowing hard, and set to work, his hands shaking as he rerouted power to the internal diagnostics. The hum spiked immediately, a piercing wail that made Elena wince, her hands clamping over her ears for a moment before she forced them back to the controls. The creatures outside reacted too, their glow flaring brighter, their movements faster, darting in tight, aggressive loops around the sub. Another impact rocked them, lighter this time, a warning tap rather than a strike, but it still sent a shudder through the hull.
“Got it!” Rory shouted over the noise, his voice strained. “It’s… it’s the comms array. The internal wiring. Something in the circuitry is resonating with the signal. Like it’s been… tuned to it.”
“Tuned?” Marcus turned, his eyes narrowing. “What the hell does that mean? You’re saying someone rigged our sub to pick this up?”
“I’m saying it’s not random,” Rory shot back, his tone sharp now, defensive. “The comms system—it’s old, yeah, but it’s standard. Nothing custom. Unless…” He trailed off, his gaze dropping to the panel, a flicker of doubt crossing his face.
“Unless what?” Elena pressed, her patience fraying. The hum was unbearable now, a physical weight pressing against her skull, her thoughts sluggish under its assault.
Rory didn’t meet her eyes. “Unless it’s not the hardware. Unless it’s… us. Something we brought down here. Something personal.”
The cabin went still, the only sound the hum and the creak of the hull. Elena’s mind raced, sifting through possibilities—equipment, personal gear, something smuggled aboard without her knowledge. Her eyes flicked to Marcus, then back to Rory, searching their faces for a hint, a crack in their masks. But before she could press further, the sonar screamed, a high-pitched alarm that cut through the noise like a blade.
“Contact!” Marcus yelled, his voice raw, his hands slamming the panel. “Big one’s moving. It’s… it’s coming right at us!”
Her head snapped to the sonar screen. The massive shape—the structure itself—was no longer static. Its outline shifted, edges blurring as if unfolding, expanding, a colossal presence bearing down on them at a speed that shouldn’t have been possible at this depth. The greenish glow on the camera feed flared, blinding, forcing her to shield her eyes as the light poured through the glass, casting eerie shadows across the cabin.
“Thrusters, full reverse!” she barked, her hands moving on instinct, the sub lurching backward with a groan of protesting metal. The creatures outside scattered, their glow dimming for a moment before surging back, brighter, angrier, their tendrils lashing at the hull in rapid, vicious strikes. The hum crescendoed, a scream now, words she couldn’t grasp flickering at the edge of her hearing—commands, pleas, warnings.
“Elena, we’re not gonna outrun it!” Marcus shouted, his voice breaking under the strain. “Hull’s at seventy percent. One more hit, and we’re done!”
“I know!” she yelled back, her teeth gritted, her hands slick on the controls. The structure loomed closer on the feed, its form no longer just metal but something alive, shifting, panels sliding and locking into new configurations, revealing more of that glowing core. It wasn’t a wreck. It wasn’t a ship. It was a mechanism, a purpose-built thing, waking after eons in the dark. And they’d triggered it.
“Rory, shut down the comms array!” she ordered, a desperate gamble flashing through her mind. “If it’s resonating with the signal, cut it off. Break the loop!”
He didn’t hesitate this time, ripping open a panel beneath the audio station and yanking at wires with trembling hands. Sparks flew, the smell of ozone sharp in the air, and the hum faltered for a split second, a stutter in its rhythm. The creatures outside froze, their glow dimming, tendrils retracting as if confused. The structure’s advance slowed, its glow pulsing erratically, no longer in sync with the signal.
But it wasn’t enough. The hum returned, weaker but still there, vibrating through the hull, and the structure resumed its approach, slower now, deliberate, like a predator savoring the hunt. Elena’s chest tightened, her breath shallow, the weight of the ocean pressing down on her as much as the weight of her choices. They couldn’t run. They couldn’t fight. They were trapped, pawns in a game they didn’t understand.
And then, through the static of the comms array, a sound broke through—not the hum, not the creatures, but a voice. Faint, distorted, crackling with interference, but unmistakably human. “…respond… Atacama… depth… critical… do not engage…”
Her blood froze. She stared at the comms panel, at the wires Rory still clutched, sparks spitting from the torn circuitry. The voice came again, clearer now, urgent. “…repeat, do not engage… retreat… surface… now…”
“Who the hell is that?” Marcus whispered, his voice barely audible, his eyes wide with a mix of hope and dread.
Elena didn’t answer. She couldn’t. Because as the voice faded back into static, the camera feed caught something new—beyond the structure, deeper in the abyss, a second glow, smaller but distinct, moving toward them. Not a creature, not a mechanism, but something familiar. A submersible. A silhouette she recognized from schematics and briefings. One of theirs. One that shouldn’t be here.
Her breath stopped. The hum pulsed once more, a final, deafening scream, and the structure’s core flared blinding white, a shockwave of light ripping through the dark as the second sub closed in, its floodlights cutting through the murk, revealing a name stenciled on its hull—a name that shouldn’t exist, a ghost from a mission lost years ago.
“Odyssey,” she whispered, the word a blade in her throat, as the abyss swallowed them whole.