Russian Flying Submarine
The Soviet Union tried to develop a flying submarine during World War II. The design could have operated at 150 knots in the air and 3 knots in the water. Metal plates sealed the engines shut. At the Naval Engineering Institute, a flying submarine project was headed by engineer Boris Ushakov. In 1939 the project was temporarily suspended and classified. In 1943, on the orders of NKVD chief Lavrenti Beria, the project was resumed. In 1947 the first test of the flying submarine was performed. In 1953, the project was closed by order of Communist Party First Secretary Nikita Khrushchev. The design never “got off the ground”.
About the Design
During the 1930s, the Soviet Union was making a concerted effort to accelerate the development of both its navy and air force. In 1934, a military cadet named Dzerzhinskiy Ushakov responded to calls for creative solutions to the challenges of modern naval combat by presenting his superiors with plans for a “flying submarine” (LPL), a craft that could flying into enemy territory, submerge and then conduct surveillance and even torpedo attacks on enemy ships before flying to safety.
Although a radical concept, the Ushakov LPL underwent serious development for several years by the Soviet military until the project was abandoned later in the decade.
Here’s a short video about the flying submarine