Diving plane
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Diving planes, also known as hydroplanes, are control surfaces found on a submarine which allow the vessel to pitch its bow and stern up or down to assist in the process of submerging or surfacing the boat, as well as controlling depth when submerged.
The port bow plane of the Soviet-era submarine B-39
US Balao-class USS Bowfin of World War II, showing bow planes rigged upwards for stowage
Stern planes of HMS Ocelot mounted directly in the prop wake, with fixed planes above.
HSwMS Gotland from above, showing fairwater planes mounted on the sail
Simon Lake
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Simon Lake was a Quaker American mechanical engineer and naval architect who obtained over two hundred patents for advances in naval design and competed with John Philip Holland to build the first submarines for the United States Navy.
Simon Lake 1919 invention for ocean salvage