On 1 June 2009 sonar mapping of the Challenger Deep by the Simrad EM120 sonar multibeam bathymetry system for deep water ( 300 - 11,000 m ) mapping aboard the RV Kilo Moana ( mothership of the Nereus vehicle ) , has indicated a spot with a depth of 10,971 m ( 35,994 ft ) .
The most recent ( 1 June 2009 ) sonar mapping of the Challenger Deep from the Kilo Moana , has found a spot with a depth of 10,971 m ( 35,994 ft ) ( 6.82 miles ) .