Welcome aboard! The Spirit Walk is a dream-rider, a vessel made for the literal space ocean from a steampunk / dieselpunk setting called The Dream. Neither airship nor submarine, it has a little bit of both.

In practical terms: the 3D model is offered as untextured STL, with OpenSCAD source included. There are two versions included:

• a 2900-tris version suitable for texturing and use in a game;
• a 5400-tris version that lacks the crane, but has more subdivisions.

The latter is intended for 3D-printing. It's been successfully tested with both resin and PLA. You'll have to do your own slicing, infilling and supports.