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People aren’t exaggerating when they say that water is life. More than half of our bodies are made up of it, and it covers some 71% of our planet’s surface. It’s constantly moving, flowing, freezing, and evaporating, shifting between liquid, solid, and gas. It’s essential to our survival, yet it can also threaten our very existence. Water is as formidable as it is indispensable.

But its most unnerving quality might be what it hides. Underwater, even ordinary man-made objects can become eerie, their creepiness magnified by the murky stillness around them. The fear they inspire even has a name, one shared by a Reddit community dedicated to these sights: r/submechanophobia. Let’s dive into some of its most unsettling posts.

#1

Aerial view of a boat floating directly above a large shipwreck, showcasing submerged objects in clear green water. A shipwreck beneath my boat.

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Bob Brezniak
Community Member
8 hours ago

That is awesome...

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    #2

    Interior view of a coral-covered cockpit of an airplane, among submerged objects underwater. Bahrain bought a 747 jet for just $100,000 from the UAE, then for 7 long months carefully removed every single fuel line, wire and plastic component from it, then tugged it into the Arabian Sea and sunk it, creating the centerpiece of the world’s largest underwater theme park.

    AlbinoAkon Report

    DennyS (denzoren)
    Community Member
    9 hours ago

    That's kinda cool and would create homes for fish.

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    #3

    Split-level shot showing a massive warship hull extending deep underwater. A 50-50 (above/below water line) view of an aircraft carrier.

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    DennyS (denzoren)
    Community Member
    9 hours ago

    Wow, that's just mindboggling.

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    Submechanophobia is the fear of fully or partially submerged man-made objects, and it might just finally explain my childhood terror of that creepy-crawly thing. You know, the thing that keeps the bottom of the pool clean? It’s a little more oddly specific than thalassophobia, the fear of the sea or vast bodies of water, but it’s no less unnerving.

    #4

    Bow of the sunken Titanic shipwreck resting in the dark ocean depths, showcasing unnerving submerged objects A view from the bow of the sunken Titanic.

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    #5

    Scuba divers exploring submerged objects like an old rusty airplane wreck on the ocean floor. The sunken B-29.

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    #6

    Diver examining submerged objects near the propeller of a massive ship wreck USS Saratoga under 200ft of Bikini Atoll Water.

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    Bob Brezniak
    Community Member
    8 hours ago

    Yeah...I don't think I would go anywhere near Bikini Atoll --- ESPECIALLY not in the water.

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    Because, really, with all that humankind has built, explored, discarded, or lost to the tides, who knows how much of our handiwork now lies underwater? The ocean alone supports an enormous amount of human activity. According to the Organisation for Economic Co-operation and Development (OECD), it provides food security for over three billion people, carries more than 80% of global goods, and hosts cables carrying 98% of international internet traffic.

    #7

    Dark underwater photo of a massive structure that depicts submechanophobia and submerged objects. Ms Estonia Shipwreck.

    TheHallsIWalked Report

    #8

    A large cargo ship capsizing in open sea water, showing unnerving submerged objects. The damaged and half sunk oil tanker Caroline Bezengi, at sea off the coast of Oman, on a date given as August 6.

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    LancePoekinhos
    Community Member
    8 hours ago

    what did they do with the oil!?

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    #9

    Sonar view of a sunken military airplane resting on the seabed among submerged objects underwater. Various US Navy aircraft found with the wreck of the aircraft carrier USS Lexington, sunk during the Battle of Coral Sea in WWII.

    Western_Homework_228 Report

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    Add climate change and rising sea levels, which threaten to swallow up more of the places we’ve built on dry land, and… well, if you have submechanophobia and the photos haven’t made you nope out just yet, you’re probably quietly freaking out right about now.

    #10

    Eerie view of toilets submerged underwater on a sunken ship wreck. Toilets inside the wreck of the HMHS Britannic.

    SomethingKindaSmart Report

    TheSubmissiveToe
    Community Member
    7 hours ago

    They cracked under pressure.

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    #11

    Eerie view of a yacht submerged objects visible under icy turquoise water near a snowy shore. Mar Sem Fim.

    TheHallsIWalked Report

    Serena Myers
    Community Member
    7 hours ago (edited)

    A Brazilian yacht that was shipwrecked, sunk, and subsequently frozen. Ardley Cove, Antarctica. Name translates as 'Endless Sea' in English.

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    #12

    An eerie underwater view of ancient submerged structures covered in moss and silt. Entire County Submerged As A Result Of The Three Gorges Dam.

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    CarEnthusiast
    Community Member
    7 hours ago

    Atlantis?

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    Writing for Verywell Mind, Lisa Fritscher explains that submechanophobia can stem from several different fears, including fear of the unknown. As she points out, that instinct to be wary of what we can’t fully see or know has probably served us pretty well as a species. After all, bodies of water can conceal all sorts of hazards that are difficult to spot, from submerged rocks and logs to dangerous currents that can sweep us into much deeper trouble than we ever intended. Being cautious about what might be lurking beneath the surface isn’t exactly irrational.

    #13

    A scuba diver exploring a massive underwater oil rig structure covered in marine life. Oil Rig Platform Eureka - 700' Of Open Water Beneath Us.

    SoupCatDiver_JJ Report

    Fred
    Community Member
    39 minutes ago

    over 200 m

    #14

    Submerged objects visible beneath the surface of a calm lake surrounded by trees. Intentional sinking for fire protection, northern Minnesota.

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    #15

    Submerged objects featuring the remains of an old destroyed bridge visible underwater next to historical photo inset. Exploded bridge from WW2 in the Danube river, Budapest.

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    itakap
    Community Member
    8 hours ago

    it's a llm generated image. the debris of the old liberty bridge had been removed decades ago.

    But Fritscher also notes that familiarity with a particular body of water can reduce the perceived risks. So perhaps that explains why I eventually made peace with the pool’s aptly named creepy-crawly.

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    #16

    Orange life raft floating capsized on the ocean surface, illustrating submechanophobia and fear of submerged objects Abandoned, half-sunken lifeboat from a vehicle carrier that sank in 2025.

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    #17

    Silhouette of a sunken sailboat, one of many submerged objects, tilting out of the water at sunset. Two wrecks and it’s getting dark.

    RotarySam27 Report

    #18

    Workers navigating a narrow walkway over submerged objects in a dark channel Inside of a cooling tower.

    the_inland_diver Report

    Moving from creepy-crawlies to actual creatures, next on Fritscher’s list is fear of animals. We’ve all seen Jaws. We know what might be swimming below, from eels and rays to the occasional larger predator, and sunken objects often make perfect hiding spots. Fritscher points out that even non-predatory animals may attack if they feel threatened, although attacks on humans are rare. Still, for some of us, even a brush with a fish (or a slimy piece of seaweed) is enough to elicit a shriek.

    #19

    Divers training near complex equipment, capturing fascinating submerged objects in a deep blue pool. NASA’s Neutral Buoyancy Lab.

    thelaststarfighter2 Report

    #20

    Aerial view of a U-shaped spillway creating an intimidating vortex in green water near a bridge. Spillway.

    No-Selection-4424 Report

    MoBeLa
    Community Member
    6 hours ago

    I find this one the most terrifying so far - the power of that thing looks crazy.

    #21

    Scuba diver illuminating strange, coral-covered submerged objects deep underwater. Engine of the SS Oregon, sunk in 1886 18nmi off Long Island, New York.

    SomethingKindaSmart Report

    Fred
    Community Member
    38 minutes ago

    18 nautical miles is a bit over 33 km

    Then there’s the fear of ships. Fritscher explains that this can range from discomfort around boats to an intense fear of enormous vessels, with submarines being a particular trigger for some people. And it’s not hard to see why. Just imagine being sealed inside a craft, miles below the surface, with nothing but darkness and water pressing in from all sides. And we’ve seen how tragically that can end.

    #22

    Eerie view of flooded concrete stairs leading deep underwater, demonstrating why people fear submerged objects. Stairs to a lower lever in Cleveland’s abandoned subway station.

    oakbarrelbear Report

    Fred
    Community Member
    37 minutes ago

    lower level?

    #23

    Scuba diver exploring a flooded interior building with green water, showcasing unsettling submerged objects Costa Concordia Wreck.

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    #24

    Narrow wooden walkway with water spraying inside an industrial structure showing submechanophobia. Inside of cooling tower.

    the_inland_diver Report

    While all this makes bodies of water sound downright terrifying, there’s an undercurrent to these fears: water can be as calming as it is unsettling. As Tamara Davison writes for The Guardian, “The ocean has long framed restorative practices for better health around the world, from Victorian-era doctors prescribing ‘sea cures’ for patients to the modern-day trend of cold-water swimming.”

    #25

    Aerial view of a massive partially submerged oil rig structure resting underwater. so Alexander L. Kielland was raised from the sea, then deliberately sunk again.

    Mundane-Advisor2076 Report

    LancePoekinhos
    Community Member
    8 hours ago

    why

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    #26

    A massive green spherical structure underwater inside a facility, an unnerving example of submerged objects Nuclear reactor pool.

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    LancePoekinhos
    Community Member
    8 hours ago

    how much $$ for you to drink a glass?

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    #27

    Police boat patrolling near submerged objects including a car visible under water Somebody drove a truck into Lake Washington.

    IntelligentEyeball Report

    Marine biologist Wallace J. Nichols helped bring renewed attention to water’s restorative power with his 2014 book Blue Mind, which explores the psychological benefits of being in, on, or near water. Since then, the idea that “blue spaces” (oceans, lakes, rivers, and even fountains) can benefit our well-being has increasingly found its way into therapeutic practices.

    #28

    An aerial view at night showing dark murky water and submerged objects glowing under industrial lights. Sunk Ferry in South Korea.

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    #29

    Scuba diver swimming near massive submerged objects supporting an offshore structure. Does It Make It Better Or Worse That Its Crystal Clear Water?

    SoupCatDiver_JJ Report

    #30

    A life-sized whale model tethered underwater by heavy chains, creating an unnerving view of submerged objects. Chained whale sculpture in a deep diving pool, Shijiazhuang, China.

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    to old to care
    Community Member
    8 hours ago

    Why!

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    As Kate Campbell, a health psychology researcher, told the BBC, “Blue spaces provide us with distractions that take our mind away from the day-to-day hassles of life.” But experts from Glasgow Caledonian University (GCU) say it goes deeper than that. According to their findings, spending time in blue spaces is linked to better mental and general health, including lower stress and anxiety, and a reduced risk of obesity, cardiovascular disease, and lower mortality.

    #31

    A scuba diver standing next to a massive ship propeller underwater, highlighting unnerving submerged objects. Commercial diving inside the Queen Mary Propeller room.

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    Fred
    Community Member
    36 minutes ago

    You mean the propeller is kept inside the ship?

    #32

    A hazy underwater view showing submerged objects like a pipe or periscope structure in dark murky water Binnacle of the Andrea Doria, photo taken just 28 hours after it sank.

    SomethingKindaSmart Report

    #33

    Underwater tracks fading into murky green water, evoking a fear of what is underwater. Chains and Rails into "nowhere".

    mhv_yt Report

    Still, while some might find peace by the water, others would rather not think about what might be lurking in the depths. Continue scrolling through (if you dare) and upvote the posts you found most terrifying, but remember, these are just a drop in the ocean. Yikes.

    #34

    Submerged objects including a small wooden boat resting at the bottom of a harbor. Sunken boat in the port, Croatia.

    sanicbroom Report

    #35

    A massive industrial cutter wheel, one of many unnerving submerged objects, dripping water on a ship deck. Dredger heads for sand dredging.

    innuendo-inyourendo Report

    #36

    Unnerving photo of a rusting submerged object visible just beneath the surface of murky green water. Glen Haven Beach, Sleeping Bear Dunes.

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    #37

    View from a boat looking down at a large submerged object visible beneath green water. The Bermuda.

    Apprehensive_Box_665 Report

    #38

    Underwater view showing submerged objects like a metal chain and ladder hanging below a boat. Chain of floating island.

    mhv_yt Report

    #39

    Large maritime floating dock with submerged objects resting in clear ocean water. Space X Starship's recovery.

    davidkwast Report

    #40

    High-angle view of deep pool featuring dark submerged objects beneath a viewing deck. Biodome Montreal.

    UnicornKitt3n Report

    #41

    Submerged objects forming an underwater barrier structure near the lakebed. Stuck in a Boat House...

    mhv_yt Report

    #42

    An eerie navigational buoy floating at night, representing unnerving submerged objects. Just me or are buoys at night absolutely terrifying.

    RemarkablePoetry9815 Report

    CarEnthusiast
    Community Member
    7 hours ago (edited)

    Yes they are terrifiying (i'm tired i can't spell)

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    #43

    Eerie tiled hallway in an underwater pool facility showing submerged objects and deep water structures This is what beneath a swim up bar looks like.

    Alarming-Highway228 Report

    #44

    Old concrete structures and a sunken boat partially emerging from river water, depicting submerged objects A sunken ship has emerged from the Danube after 89 years.

    MontePhess Report

    #45

    A view inside a dark tunnel flooded with rushing water, displaying unnerving submerged objects and flow Base of small glory hole.

    Affectionate-Fan9250 Report

    TheSubmissiveToe
    Community Member
    7 hours ago

    Ummm...

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    #46

    Submerged objects like old train tracks leading straight into a clear lake shore. Pilgrimage to see this at Lake Tahoe.

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    #47

    Large metal chains as submerged objects hanging in murky green water. The Wires Of A Can-Buoy.

    Relevant-Ear4677 Report

    #48

    Clear view of a boat submerged underwater near a dock, causing fear of submerged objects. Boat no Float.

    BlueCoconutnut Report

    #49

    A large grid layout inside a spent fuel pool, showcasing submerged objects deep in an industrial water tank Nuclear power station spent fuel pools.

    Paul_S_Moran Report

    #50

    A flashlight beam shining down flooded stairs leading into dark water with submerged objects. Basement of a former pharmaceutical site.

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    nottheactualphoto
    Community Member
    5 hours ago

    "Pharmaceutical site?" What does that mean?

    #51

    Pink mannequin arms reaching out of murky water, representing unnerving submerged objects. Hands in the water, Marble Mountain Vietnam.

    RevolutionaryAgent6 Report

    CarEnthusiast
    Community Member
    7 hours ago

    Art?

    #52

    A detailed scale model of a submerged ship bow displayed under a glass floor, evoking submechanophobia. Scale Model of the Titanic.

    awkjen Report

    nottheactualphoto
    Community Member
    5 hours ago

    National Geographic museum.

    #53

    Dark underwater elevator shaft filled with murky green water and rusty cables, showcasing submerged objects. A flooded, rusted interior area, specifically identified as a section within the Gros Ouvrage Mont des Welches.

    Nice_Session2372 Report

    LancePoekinhos
    Community Member
    8 hours ago

    you better mix some steroids into that tetanus shot

    #54

    A partially submerged object showing a large white vessel tipping into murky river water The McBarge capsized and slowly sinking in British Columbia.

    Lukington17 Report

    Elladine DesIsles
    Community Member
    7 hours ago (edited)

    We had a floating convenience store (technically, an art installation) in Toronto Harbour this summer, but thankfully, no McDonald's. Lake ONTARIO doesn't need any more pollution, thanks. Nor do the Great Lakes need any more shipwrecks.

    #55

    Submerged objects like metal stairs disappearing into murky water The stairs that make my skin crawl….

    cocktail_wiitch Report

    #56

    View of murky green water beneath a dock showing submerged objects They're Building A Glamping Platform & I Had To Swim Under It!

    Relevant-Ear4677 Report

    #57

    Massive rusty shipwreck tilted on its side near rocky cliffs, showcasing unnerving submerged objects. The MV Jernas, abandoned along the rocky coast of Aftalqut west of Salalah.

    Reporex Report

    #58

    Eerie indoor pool with a low ceiling and submerged pillars, showcasing unnerving submerged structures. Underground water storage tank.

    TheGreatPear7 Report

    #59

    A car sitting among submerged objects just below the clear green water surface next to a wooden pier. Sunken boat in shallow waters.

    pseudo-mathematician Report

    #60

    Submerged objects including wooden tracks leading down into murky water. Slipway by the boathouse.

    GremlinAbuser Report

    #61

    Unnerving sunken airplane cockpit, one of many submerged objects underwater. Eccleston Delph Dive Centre.

    TheHallsIWalked Report

    #62

    Eerie view of a boat among submerged objects resting on the dark lake floor. Capernwray Dive Centre.

    TheHallsIWalked Report

    #63

    Divers inspecting large submerged objects with flashlights under deep green water. Some clever clogs took a scenic dive to visit and intake pipe.

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    nottheactualphoto
    Community Member
    5 hours ago

    And.

    #64

    Wooden dock planks visible underwater as submerged objects near a forested shore. One of the creepier swimming holes I’ve been to in a while.

    water_refill_station Report