Smallest prototype submarine

The smallest submarine was made by Pierre Poulin (Canada) and has a displacement of 620 kg (1366.9 lb). Its official dive was made in the Memphremagog Lake, in Magog, Quebec on 26 June 2005. The smallest submarine called ‘BIG’ (620 kg including the weight of pilot) made by Pierre Poulin was easily capable of turning through 360 degrees and ascending and descending under its own power. The pilot, Pierre Poulin, controlled the submarine from a watertight compartment, stayed submerged for 43 minutes to a depth of 5 m and covered a distance estimated at 1.500 ft from the launch area.