1957–1958 – RV Vityaz – In August 1957, the 3,248-ton Vernadsky Institute of Geochemistry research vessel Vityaz recorded a maximum depth of 11,034 metres (36,201 ft)±50 m (164 ft) at 11°20.9′N 142°11.5′E﻿ / ﻿11.3483°N 142.1917°E﻿ / 11.3483; 142.1917 in the western basin of the Challenger Deep during a brief transit of the area on Cruise #25. She returned in 1958, Cruise #27, to conduct a detailed single beam bathymetry survey involving over a dozen transects of the Deep, with extensive examination of the western basin and a quick peek into the eastern basin.[20][21] Fisher records a total of three Vityaz sounding locations on Fig.2 "Trenches" (1963), one within yards of the 142°11.5' E location, and a third at 11°20.0′N 142°07′E﻿ / ﻿11.3333°N 142.117°E﻿ / 11.3333; 142.117, all with 11,034 metres (36,201 ft) ±50 m (164 ft) depth.[22] The depths were considered statistical outliers, and a depth greater than 11,000 m has never been proven. Taira reports that if Vityaz's depth was corrected with the same methodology used by the Japanese RV Hakuho Maru expedition of December 1992, it would be presented as 10,983 metres (36,033 ft) ±50 m (164 ft),[23] as opposed to modern depths from multibeam echosounder systems greater than 10,900 metres (35,800 ft) with the NOAA accepted maximum of 10,995 metres (36,073 ft) ±10 m (33 ft) in the western basin.[24][25]