A computer that goes in the sea base that scans and makes a wiki of all the things you find. it needs power and can be damaged by water.
Cleaning sea water needs filters and the pressures need to be regulated at all times. sea base with power can clean water but you have to make the filters witch if you don't regulate the pressure won't last very long so... then you upgrade to self regulate but you need more power to do that.
so you're making power cells like mad to make clean water, what do you do, solar cells. Floating solar cells charge batteries for the sea base, but storms mess that up too. thermal power time.
at one point I'd love if you never have to see the sky again. By the time anyone shows up to help you. you'll have died of old age I'm guessing. all there is to do is learn as much as you can for the next landing party.
I love this game, the idea, the sea life and just how hopeless it is. zombies mah. maybe you'll find someone. in space, a alien planet, alone, with enough tech to live but not enough to escape.