Armaments: none Crew: 1 Engines: 2 Hackenbacker Inchworm engines Height including rear aquaplanes: 3.7 metres (12 feet) Length: 8 metres (26 feet) Maximum diving depth: 11,000 metres (36,090 feet) Maximum speed (surface): 185 km/h (115 mph) Maximum speed (underwater): 278 km/h (173 mph) Power source: hydrogen fuel cell power plant Weight: 13 tonnes Width including rear aquaplanes: 5 metres (16.5 feet)