Photograph via snooOG

View and submit posts containing the wonderful, dark, and largely unknown world in the deepest depths of our oceans.


  1. No memes, captioned images or rage comics

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  4. Make sure what you are posting is real (please post fictional creatures to /r/thedepthsbelow). This includes fan art, collages, sculptures, etc.

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  7. Post deep sea creatures only! Please, no living things from shallower waters. As a rule-of-thumb, if it is found in the lower (350m) mesopelagic (twilight) zone or deeper, it may be posted here.

  8. Duplicate content will be removed at the discretion of the mod team.

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Below is a brief overview of the pelagic zones in the ocean:

Epipelagic zone (sunlit) (surface to 200m deep)

This zone is exposed to the surface, and receives enough light for photosynthesis to occur. You won't find any deep sea creatures here! Examples of life found here.

Mesopelagic (twilight) (200m down to 1000m deep)

This is much deeper than epipelagic, but not the deepest. Creatures from the lower part of this zone (500m-ish) may be posted here. Photosynthesis is stunted here, due to insufficient light penetration. At about 500m, oxygen is greatly depleted. Hatchetfish, Snipe eels, and Stomiidae (dragon and viperfish) are all found in varying depths of this zone.

Bathypelagic (midnight) zone (1000m down to 4000m deep)

Alright, this is where it gets deep! At this point, the ocean is pitch black, and many organisms have adapted by becoming bioluminescent (think glowing fish). Many animals here survive on a substance called "marine snow" which is a combination of dead or dying organisms, protists, fecal matter, and other inorganic silt (sand, rock, etc.) Creatures here come in many shapes and sizes, from big, (bigfin squid, 8m in length) to small. (osedax worms, approx 10mm in length)

Abyssopelagic zone(lower midnight) (4000m down to ocean floor)

Just looking at the name of this harsh zone should give you an idea of how deep it is! Few creatures manage to survive the extremely cold waters, and the complete lack of light. The various anglerfish are some of them.

Hadopelagic (deepest part of the ocean, such as the water in the mariana trench)

This zone is truly abyssal, and almost completely unexplored by humans. It's name was derived from Hades, the underworld in greek mythology. Here is a chart that details the pelagic zones.
Source: NOAA

Citation for image: Baum, S. (2011). Epipelagic zone.

Educational and scholarly articles are encouraged. If your post is not scientifically verifiable (such as an urban legend), or not based in reality, please consider posting to /r/thedepthsbelow.

We welcome all marine or deep ocean enthusiasts here. You don't have to be a marine biologist to post, but please try to keep your posts factually accurate. False or sensationalist posts may be subject to removal. Citations for articles or information are encouraged, but not required.

Finally, here are some helpful links to wikipedia articles for those who wish to learn more about the murky depths

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Trying to find a video, please help?

Edit: FOUND!!

I saw a documentary on Netflix I believe, I have no idea what it's called, but it was about sharks mating. Two sharks mate (aggressively of course) and the poor female looks like she is being brutalized.. but right after the male pulls out of her a random eel pops out of the ground and bites him right on his clasper. It's exactly as hilarious as it sounds and I want to send it to my husband, but I can't find it. Can anyone help me find this please?

Found!!! Disney+ 50 Shades of Sharks Episode 1 from 38:50 to 39:10.

00:02 UTC


can someone explain siphonophores? like the different parts & how they work?

I understand that they are a colony of small creatures (zooid) that sort of work like a single creature.

Beyond that I am pretty lost.

Are the different parts different zooids? like is the head made up of type A, body type B?

How do the ones that aren't collecting food get fed? do they reproduce as one zooid and then change to a head/body/tentacle type?

wikipedia is using far to many big words, and I can't find an explanation anywhere else.

02:46 UTC


Biologist/deep sea creature fanatic friend needed

Hello, I'm looking for someone to share facts about deep sea creatures with whenever we find something cool and new.

I know probably nothing compared to the rest of this server so would probably not be able to contribute much

I don't have the app so intervals between texts will probably be a couple 6 months or so

This is my favourite character in Octonauts at the moment

This is my favourite animal (colossal squid)

Can I swim?

Kind of

It's one of my dreams to take a submarine ride one day

Thank you for your consideration!

01:14 UTC


Is there any video archive of a sea camera just recording video of deep sea like 1 hour or longer than 20 minutes?

I would like to know

23:31 UTC


Looking for a specific youtube channel

A couple of years ago I stumbled upon a youtube channel that did unmanned deep sea drone exploration. I believe the channel was run by a university or research organisation, and they uploaded uncut videos of their dives. They would be 40m-1hr long videos, and the team would be recording the drone footage and audio of them talking amongst themselves mid exploration. I can't for the life of me find the channel, does anyone have any idea of who these guys were?

22:59 UTC


Two stills from a video taken off the coast of California in 1962 showing a yet unidentified sea animal nicknamed "Marvin". It was estimated at 15 ft (4 m) in length

09:16 UTC


PILOT WHALE ─ Even Orcas are Afraid of the Cheetahs of the Deep Sea!

20:05 UTC


Does this theory have any merit?

Had an interesting idea. Since the confirmed sightings of Bigfin Squid are Paralarvae, Larvae, and Juveniles, What if the Adults of Bigfins end up being Colossal Squid. You know, like a whole Nanotyrannus to T. Rex scenario?

23:12 UTC


An artwork of Osedax, a genus of marine worms specialized in eating bones, comprising 29 species until now. They were first described in 2004, have no digestive system, and for almost all species, the males are tiny and remain inside the female's tube.

00:55 UTC


Bizarre Chiroteuthid squid spotted in the deep sea off the Galapagos Islands

22:58 UTC

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