While living in France, Fulton designed the first working muscle-powered submarine, Nautilus, between 1793 and 1797. He also experimented with torpedoes. When tested, his submarine operated underwater for 17 minutes in 25 feet of water. He asked the government to subsidize its construction, but he was turned down twice. Eventually, he approached the Minister of Marine and in 1800 was granted permission to build. The shipyard Perrier in Rouen built it, and the submarine sailed first in July 1800 on the Seine River in the same city.