Made for Blankhans's AA survival/coop game Coreborn.
I can only think of one time before in my career where I've had to model a water/sea creature. And the texture was made by the VFX artist, so it doesn't really count!
Quite happy with my work on the materials here, the hardest part is not to make a material look close to reality, but to have it match the art direction and still make it be believable.

For a version of the concept with barnacles and lichen: https://www.artstation.com/artwork/m8JXkY