Depth Levels

Depth is one of the main HUD indicators and central to navigating the Cyclops in Subnautica.

Depth is currently only measured underwater - if the player's position is above sea level, the indicator will still show as 0 meters.

Stages
There are currently three stages of Depth. The indicator will change color if it passes to another stage. Each stage affects the Cyclops in different ways.

When the Cyclops goes past 100 meters, the computer system will warn the player that he is leaving the safe zone. When the Cyclops goes past 200 meters, the computer system will warn the player that hull damage is imminent. The player then has a few seconds to turn back before the Cyclops starts to spring leaks. The player then has to turn back, as attempts to repair the damage past the 200-meter-mark will be futile.

Currently, the player can go to greater depths than the cyclops without taking damage. However, the player depletes oxygen faster as they go deeper.

Speculation
As Depth has many effects outside the Subnautica universe, it might well be that it will affect more things in future builds, such as for example the player's health or usage of oxygen.

Also, it may be thinkable that the player will be able to upgrade the Cyclops so as to make it more resistant to the negative effects of Depth. Currently, there is a Reinforced Hull Fragment in the game, although its future uses are unknown.