Check out Low Poly Submarine Low-poly 3D model on CGTrader for $2. High-quality mesh by hamedalaa101: 35790 polys, 18314 vertices. Animated, Textured, UV Mapped.
STL (Stereolithography, filesize: 1.71 MB), OBJ (OBJ, filesize: 2.4 MB), FBX (Autodesk FBX, filesize: 1.47 MB), 3DS (3D Studio, filesize: 1.69 MB), PNG (PNG, filesize: 200 KB), JPG (JPG, filesize: 200 KB)