Mancub from CoceptArt.org presented a few Victorian Era Submersibles The first is [I]H.M.S. Narwhal[I] which is more of a recreation/exploration submarine. The second is the Seppuku, which is used to slice the belly of a ship, sink said vessel, and carry away precious cargo unnoticed while masquerading as a sea monster/hell-bent-crustacean. Both are part of a larger narrative and feature functioning parts.
Great Work!!