Question: Nikolai Vladimirovich Zateyev was the commander of one of the first two what?
Sentence (from "Nikolai Vladimirovich Zateyev"): Nikolai Vladimirovich Zateyev (Russian: Николай Владимирович Затеев ) (c. June 30, 1926 – 28 August 1998) was a Russian submariner and a Captain First Rank in the Soviet Navy, notable as the commander of the ill-fated Soviet submarine K-19 in July 1961 during the Hotel class submarine's nuclear-reactor coolant leak.
Relevant evidence: Yes