You don't need an airlock if you enter from underneath. Cyclops uses this concept but why not bases, seamoth, and prawn. Water can't enter unless air escapes. Airlocks should be only used if not entering from underneath.
I was on my way to Inactive Lava Zone in my cyclops. In Lost River had 90% power half way there got attacked by crabsquids EMP pulses and when I was at entrance to Tree minibiome had like 5% left. Think EMP from them killed powercells? Also when I …