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Caspian Sea Monster

Ground effect vehicle
The KM, known colloquially as the Caspian Sea Monster, was an experimental ground effect vehicle developed in the Soviet Union in the 1960s by the Central Hydrofoil Design Bureau. The KM began operation in 1966, and was continuously tested by the... Wikipedia
Weight: 529,100 lbs
Top speed: 311 mph
Engine type: Dobrynin RD-7
Length: 302′
Wingspan: 123′ 0″