About r/thalassophobia
In its own words:
Less than 10% of the ocean has been explored. For more information see: https://reddark.untone.uk/
Community guide
r/thalassophobia (#621, about 1.7 million subscribers) — Less than 10% of the ocean has been explored. For more information see: https://reddark.untone.uk/ A recent sample averaged 4.0 posts a day (~67% video, ~30% image, ~3% text). Its public rules include: Only thalassophobia related posts and titles; Restrictions on sea life; Use proper titles; No jokes, memes, or cartoons; Be nice and courteous.
What belongs here
Stay inside the room’s stated scope rather than adjacent fandoms or general off-topic dumps. Low-effort memes or empty shitposts are commonly removed—add context that fits the room’s purpose.
How it differs from lookalikes
The length of the public rule list is itself a signal: skim all of them once before assuming defaults from similar communities.
Practical pointers
Read the current sidebar/rules on Reddit before posting; rules can change. Search the sub before reposting common clips or questions. Avoid clickbait titles; say what the post actually is. Common flairs include: (OC) Art, Question, OC, Animated/drawn.
The community was created on Jun 3, 2013, which makes it 13 years old. Since Nov 2, 2026, it has gained 798 subscribers (+0.05%). It sits just behind r/acne (#620) and ahead of r/Turkey (#622) in our ranking.
What sets r/thalassophobia apart
r/thalassophobia is far more video-driven than most big subreddits: 67% of its recent posts are videos, against a median of 4% across the Top 100. Relative to its huge audience, posting is calm — around 2.3 new posts a day per million members, which puts it in the quietest fifth of the Top 100. A good post has less competition here.
Subscriber growth
Between Sep 19, 2026 and Nov 9, 2026, r/thalassophobia grew from 1,737,338 to 1,745,257 subscribers (+7.9K, +0.46%). That is about 155 new members per day. The chart shows 10 weekly subscriber counts.
Top posts on r/thalassophobia this week
This week’s highest-ranked posts, in Reddit’s own order (collected Nov 7, 2026).
- Waves determine when to breatheu/speeshuttle · Nov 2 · video
- Get fish or die tryin’u/nsfws4 · Nov 1 · video
- The Sea Shall Have Its Way. Original charcoal and pastel art by me.u/Rusty-willy · Nov 7 · image
- Rise of the Kraken, oils on canvasu/sheldonboadita · Nov 3 · image
- Found this lil pic on my pc from back when I was learning photoshopu/SlamJam64 · Nov 4 · image
- You’re on a floating lighthouse that can submerge. Beneath you is the abyss, and the shore is dozens of miles away. This is the psychological horror I’m working onu/NuttyMadness · Nov 6 · video
- Is drowning actually peaceful? Because I feel like it's not.u/Famous-Cabinet-5036 · Nov 1 · text post
- ( OC ) swarm of thimble jellyfishu/benfreediver · Nov 2 · image
- Lesser Sea Maw (Made for an Alien World project 'Planet Lethe')u/Iszth · Nov 7 · gallery
- The ocean is magical & nightmare fuelu/Dubstepshepard · Nov 6 · video
All-time top posts
The highest-ranked posts in the history of r/thalassophobia, from 2018 to 2026, ranked by Reddit.
- So much is happening I don’t even know what to sayu/Nottoobad777 · Sep 25, 2021 · 67,502 points · 1,167 comments · video
- Terrifying wave created by ice falling into the oceanJan 10, 2021 · video
- Deadheads are water soaked logs that float vertically and can weigh tons.u/lagueraloca · Oct 18, 2023 · video
- Well that's just horrifyingNov 21, 2023 · video
- Splendid view through the porthole.Jun 25, 2018 · 38,172 points · 603 comments · image
- Is to me or are black tiled pools terrifying.u/Desperate_Squirrel20 · Jan 9, 2022 · 38,720 points · 899 comments · image
- Wouldn’t scraping lead to corrosion?u/nsfws4 · Aug 9, 2025 · video
- Im tired of all the shark pictures because they don't freak me out. Here's Point Nemo, the spot farthest away from any land in the world. You are closer to astronauts aboard the ISS than humanity. Go…u/TotalIdiotNerd · Jul 26, 2020 · image
- At least we can agree on somethingAug 29, 2019 · 29,268 points · 272 comments · image
- The last person to ever touch that rocku/fallasbro · Sep 13, 2022 · 27,398 points · 791 comments · video
What r/thalassophobia talks about
We read the titles of 30 recent posts (Oct 29–Nov 4), the words that come up most are “sea”, “game”, “deep”, “ocean” and “ground”. Other frequent themes are horror, fine, thanks, seek, eternal and ascending. Recurring phrases include “horror game”, “ground thanks”, “eternal ascending” and “deep sea”. By format, 67% are videos, 30% are images and 3% are text posts.
Popular post flairs: (OC) Art (2), Question (2), OC (2), Animated/drawn (1).
Activity and best time to post
r/thalassophobia gets about 4.0 new posts a day. The public archive holds 79,707 posts and 1,340,356 comments in total, about 16.8 comments per post. Last week the busiest day was Friday (8 posts) and the quietest was Tuesday (1). Posting peaks around 14:00 UTC and is lowest around 00:00 UTC.
Rules of r/thalassophobia
The moderators of r/thalassophobia list 8 rules. In short:
- Only thalassophobia related posts and titles
- Restrictions on sea life
- Use proper titles
- No jokes, memes, or cartoons
- Be nice and courteous
- No Reposts
- No gore
- Posts with game or AI content may only be posted on Friday
How to join
Open reddit.com/r/thalassophobia and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How big is r/thalassophobia?
r/thalassophobia has 1,745,257 subscribers (Nov 9, 2026), which makes it the #621 safe-for-work subreddit in the SubMouse ranking. It added 7,919 members between Sep 19, 2026 and Nov 9, 2026.
How old is r/thalassophobia?
r/thalassophobia was created on Jun 3, 2013, so it has been around for 13 years.
How active is r/thalassophobia?
Moderately: r/thalassophobia gets about 4.0 new posts a day (average of the last four weeks). Over its lifetime the archive counts 79,707 posts and 1,340,356 comments.
When is r/thalassophobia most active?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Friday and the quietest Tuesday, and most posts arrive around 14:00 UTC, with the fewest around 00:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What is r/thalassophobia about?
The community describes itself as: “Less than 10% of the ocean has been explored. For more information see: https://reddark.untone.uk/” Recent post titles often mention sea, game, deep, ocean and ground. Most posts are videos (67%).
Is r/thalassophobia safe for work?
Yes. Reddit does not mark r/thalassophobia as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
How do I post on r/thalassophobia?
Join the community on Reddit first, then use “Create post”. r/thalassophobia accepts both text and link posts, with images, videos, galleries and polls enabled. It has 8 posted rules, starting with: “Only thalassophobia related posts and titles”; “Restrictions on sea life”; “Use proper titles”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
Which communities are like r/thalassophobia?
Communities with similar topics include r/4chan (1.4M).
Stats from public data (data updated Nov 9, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026; top posts from Reddit’s public feeds). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/thalassophobia.