Pyotr Lebedev is a research vessel, built at Wärtsilä Crichton-Vulcan in Turku, Finland, originally as a merchant vessel Chapayev in 1957. She was subsequently acquired for the Soviet Union and refitted as a research ship. The vessel was owned and operated by the Andreev Acoustics Institute, and was used to make hydrophysical observations of the Atlantic Ocean such as during the Polygon experiment. Pyotr Lebedev possessed five on-board laboratories used to study hydroacoustics, hydrology, hydrobiology, hydrochemistry, and electronics. The ship was active as a research vessel from 1967 until 1977. She is current registered in Saint Vincent and the Grenadines.
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