1992 – RV Hakuhō Maru – The 3,987-ton Japanese research vessel Hakuhō Maru, an Ocean Research Institute – University of Tokyo sponsored ship, on cruise KH-92-5 cast three Sea-Bird SBE-9 ultra-deep CTD (conductivity-temperature-depth) profilers in a transverse line across the Challenger Deep on 1 December 1992. The center CTD was located at 11°22.78′N 142°34.95′E﻿ / ﻿11.37967°N 142.58250°E﻿ / 11.37967; 142.58250, in the eastern basin, at 10,989 metres (36,053 ft) by the SeaBeam depth recorder and 10,884 metres (35,709 ft) by the CTD. The other two CTDs were cast 19.9 km to the north and 16.1 km to the south.