'' Vityaz '' had Vladivostock as her port of registry . She made 65 voyages covering . In August 1957 , She measured the depth of the Mariana Trench at . On 29 May 1958 , '' Vityaz '' was west of the Marshall Islands when she detected radioactivity in rainfall at levels that were harmful to human health ( see Operation Hardtack I ) . On 7 November 1960 , '' Vityaz '' was reported to have been buzzed in the Arabian Sea by a Grumman S-2F Tracker from . The United States Navy denied that the aircraft was buzzing the ship , but merely establishing her identity . With their introduction in the 1960s , '' Vityaz '' was allocated the IMO Number 5382609
Operation Hardtack I
Operation Hardtack I
RV Vityaz (1939)