The Energy Observer, the world's first hydrogen boat, arrived in London, England for its 47th stopover on Thursday and passed under one of the city's most iconic buildings, Tower Bridge. /VCG Photo

The boat, nominated as the French representative of the United Nation's 17 Sustainable Development Goals, will remain in London for 10 days at St. Katherines Pier. /VCG Photo

The boat-powered by solar, hydrogen, wind and water energy - is designed and operated with the goal of total zero-emission energy autonomy. /VCG Photo

The former race boat, which was later transformed into a hydrogen-powered vessel, shows people a sustainable future where humans can live with nature in harmony. /VCG Photo