The futuristic egg-shaped river shuttles, the creation of French yachtsman Alain Thébault and Swedish windsurfer Anders Bringdal, are due to be tried out in the French capital next spring at the request of the environmentally conscious city hall. Made of fibreglass and high-density foam, the solar energy-powered vessels can carry five people and, with the help of foils fixed to the hulls that reduce drag and cause the shuttle to “float” about two foot above water, can reach speeds of up to 30kmh. Mr Thébault hopes that eventually Sea Bubbles will be able to be hailed on apps such as Uber, and he estimates that fares in Paris will be around €10 if and when the project gets the final green light.