All of the pieces are available in the Lego City Deep Sea Starter Set 60091. I always like to have vehicles the minifigs can operate, so I came up with this mini sub design. A couple of the pieces show up as rare color when I uploaded the lxf file, but any color would work for these parts.
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This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model