DeepFlight Dragon Prototype Sub - Lufthansa Magazine When you get the call to document the test dive of a 1.5 million dollar prototype submarine in the beautiful blue water of Lake Tahoe you just say "YES!" My assignment was to shoot a new two-man submarine called the DeepFlight Dragon. The story ran as the feature in Lufthansa Airline's inflight magazine (November 2016). Submarine Facts: The DeepFlight Dragon is a prototype and currently the only one of its kind in the world. The sub runs completely on electric power making virtually no noise in the water. One charge is good for 8 hours of dive time. The sub doesn't use a ballast system like a traditional sub. Instead, it relies completely on propulsion to dive. This means that if all the systems fail the sub is buoyant and will steadily float back to the surface. The sub can dive to a depth of 400 feet DeepFlight is based near San Francisco making Lake Tahoe the closest clear water to test the sub.