I guess (as it’s been a while since I used a Seamoth and it was back in early access days) that a few blasts from the Seamoth’s electrical defense system will send anything to the grave, provided you have enough energy.
For the small critters, yeah, propulsion cannon, but I don’t have it, so…the knife is totallt useless (they take 2-3 hits to die and are moving all around the place) so I ended up trying to drown them with the fire extinguisher which, aside from the fact that it enabled me to vent a bit of the deep hatred I have for these fuckers, didn’t do anything.
I mean seriously I hate them. They’re creepy, they eat humans, they’re bouncy, they’re surprisingly tough for their size and they live in important/interesting places that should be safe, they’re like a living check-list of what annoys a player. They remind me of the small rachni workers that try to swarm you in one of ME3’s missions, the only difference being that in ME3 you have a goddamn flamethrower.
Also what’s the use of the gravity sphere ? Seriously ?