Thank you so much, you are very kind. This was the first "proper" game we made, so these comments mean a lot.
There IS a bottom to this mistery, actually I am very much looking forward to someone finishing the game, because I take pride in its ending, and I am very curious of how people like it.
The map ends at around 400 meters, so you were halfway. Just remember to collect O2, and batteries, and sometimes rely on the sensors, instead of spamming the sonar. I know it needs a bit of getting used to.
Thank you again, this really gives us motivation to build this game further.