OMAR 7000 aka "Lobster"

OMAR 7000, also known as Lobster, is a submersible designed by KAROONA Inc. to dive to the deepest parts of the ocean. Its hull can withstand massive pressure and can support a crew of 2. The vehicle is entered and exited through a hatch in the front. The Lobster also has a powerful manipulator arm designed especially for handling of objects deep underwater. Modeled in Blender and rendered in Cycles.

See the article of how I made this: https://80.lv/articles/working-on-a-submarine-underwater-look-in-blender/