Depth Levels

Depths are deep places in Subnautica.

Basics
The majority of the depths is covered by grassy plateus but they are many other Biomes, some of them are rare and other ones are very dangerous...

Deepest?
The Cyclops submarine can only go to the depth of 200 meters before starting to crush. There is a warning at 100 meters by the on board AI. But the Seamoth is a small compact sub built for speed and deep diving. The Seamoth is also somewhat fragile and uses up a lot of energy quickly. Its deepest depth is currently unknown. Personal Logs:

"The main problem with going really deep in survival mode is the energy used on the Seamoth sub. The main problem is the return trip.  When I visited 1300 meters deep it was very dark and the noises down there were eerie, and the energy I had used to that point was around 60%.  I know I could have gone deeper... but running out of energy at the depth would have been instant death.   The descent and ascent from those depths was about 10 minutes total from departing the Cyclops to re-coupling with it.  If I had gone passed 50% energy on the descent I would not have made the return trip to the surface with enough energy in the Seamoth.  And to play it "safe" I made sure I turned around at 60% in case of running into large creatures... which happens in the deep ocean.  The picture shown is at the depth of 1203 meters, facing straight down.  I used the edge of a trench wall as a guide.  I was able to make it another 97 meters before calling it quits. (I have yet to die and I didn't want to die in a deep trench)." - TheCen

Developer
According to the Steam Forum one of the developers mentioned the deepest anyone can go is 2000 meters. (Feb 21) Although, there are some screenshots of deeper depths... they all ended with a crash of the game.