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Inside the main cabin of MS Turanor Planet Solar, the first boat to travel around the world on sunlight alone, Christian Ochsenbein opens a trap-door hidden beneath a seat cushion and crawls inside. He climbs down a dark tube and squats inside a long, narrow chamber-one of two pontoons keeping the catamaran afloat. "We are now inside the 'engine' room," he jokes. This being a solarpowered boat, there is no real engine to see. He points out the propeller shaft, driven by AC motors, and at the opposite end, a vault that houses solarcharged batteries.