Claim: Konstantin Khrenov was a Soviet engineer and inventor who in 1932 introduced underwater welding and cutting of metals which was used extensively in World War II by the Soviet Navy.
Evidence: Konstantin Konstantinovich Khrenov (Russian: Константин Константинович Хренов; 13 February 1894 – 12 October 1984) was a Soviet engineer and inventor who in 1932 introduced underwater welding and cutting of metals. For this method, extensively used by the Soviet Navy during World War II, Khrenov was awarded the State Stalin Prize in 1946.