DeepC

The DeepC is a hydrogen-fueled Autonomous Underwater Vehicle (AUV), power-assisted by an electric motor that gets its electricity from a fuel cell. It debuted in 2004. The project was funded by the German Federal Ministry for Education and Research.

The DeepC is the first UAV to use hydrogen as a fuel.

Specifications
DeepC weighs 2.4 tons, can operate in depths of up to 4000 m, for a duration of up to 60 hours independently of a ship, at a speed of 4 to 6 knots. It can cover up to 400 km with a payload of up to 300 kg. It has two 60 cell PEMFC stacks.