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Largest deep sea research submersible

Largest deep sea research submersible
Who
Ben Franklin
What
133.8 tonne(s)/metric ton(s)
Where
Not Applicable
When
14 July 1969

The Ben Franklin (PX-15) measured 14.85 m (48 ft 9 in) in length, with a displacement mass of 133.8 tonnes (295,000 lb). She was developed by NASA and Northrop Grumman (both USA) and built in Switzerland. On 14 July 1969 she was launched, with a crew of six, on a 30-day mission to drift in the Gulf Stream at a maximum depth of 600 m (1,970 ft). She was sold privately in 1971 and now is on display at the Vancouver Maritime Museum, Vancouver, Canada.