No Man's Sky

So, I'm doing the expedition and trying to not get irritated about it as is usual for me.

Unfortunately, the game isn't playing along with that. I'm on one of the moons of the starting gas giant. The paradise world. I'm trying to find all the animals so I can retrieve some things I actually like rather than the stating gear.

Most of the animals are aquatic so I jump into the water... I haven't tried finding fish in quite a few updates but it appears some of them spawned in a water-cave under the lake I found. I dig down and... the moment I enter any hole in the ground while underwater I'm returned to the surface.

This lake isn't deep so I'm fighting buoyancy the entire time but being snapped back to the surface doesn't seem like an intended behavior.