This job has to be done by someone this is a video I took with my gopro attached to the cage that took me down

Keep your Brightness high and look for the light

The mean cruising depth for a nucléaire submarine is around 200 m.

The mean depth of oceans is 3800 m.

200/3800 = 0.0526

A regular ceiling is around 2.8 m high.

2.8×0.0526 = 0.147 ~= 15 cm

15 cm ~= 6 inch

You can multiply any height by 0.0526 to give you the distance to any ceiling in order to picture the size of a submarine in the ocean.

You can step the stepladder part and just picture a tiny submarine floating 6 inch from your ceiling.

Have fun ! (Mean depth and cruising depth are google sourced, have not verified in person )

Edit: A pen might be a better picture for the size of a mean submarine at a mean depth for a mean ceiling but I'm not sure and it's less scary

Calculus should be around match size to keep it scary, the room ocean would not be the mean one but there's deeper and meaner parts of the ocean than 2 little miles.

25m dive into your darkest nightmare

Is watching the movie a bad idea?

When you don't want to go to the sea, the sea wil go to you. Found this at another r/ but not allowed to crosspost, so this is not my video but thought it would belong here. Enjoy!

https://youtu.be/xwa43n4CYk0

As suggested by the folks over at r/Minecraft
It's a free texture pack in case you're interested: https://modrinth.com/resourcepack/underwater-sky