Advance Force Pearl Harbor (1992) by Burl Burlingame thoroughly covers the midget submarine attack on Pearl Harbor, but The Coffin Boats also has detail.
The design role for the midget sub had always been as a fast and stealthy delivery platform given plenty of latitude (Burlingame, 1992:51). Larger submarines.
Pearl Harbor and the Japanese Midget Submarines | reflections from my underwater world. Advance Force Pearl Harbor by Burl Burlingame .. the debris from the West Loch disaster (May, 1944), hence the LVT's et al that were found with it.