PlanetSolar's Turanor is the world's largest solar powered boat, and it's set to be to the first engine-propelled boat to travel around the planet using nothing but the power of sunlight.

The Swiss-built boat has been 'sailing' at an average speed of 4-5 knots along the equator, where the sun shines the strongest. It is set to complete its 18 month voyage in three months, when it will arrive in Monaco.