This is a lowpoly submarine created in Blender, based on the Barsuk submarine from the video game Barotrauma. This asset is game-ready, UV unwrapped, and comes with custom-baked PBR textures as well.I have used this model as a part of many underwater and deep sea projects in the past, and it is very versitile as well as performant (won't stand incredibly close scrutiny, but looks great from a distance).
*Note that the FBX file has a baked basic animation of the submarine moving - so don't be surprised if it floats away and feel free to delete the keyframes ^^ *