Getting a depth module in Subnautica 2 increases your tadpole submarine‘s depth resistance and lets you explore further without having to worry about finding oxygen spots. However, you’ll reach the tadpole’s limits before you find the module, and if you’re not looking around, it’s possible to miss this essential upgrade. You’ll need some new materials to craft the device needed to make the mod, though, so it’ll take a little bit of gathering before you can outfit your tadpole.