Josef Papp was found floating in a life raft near Brest, France. He claimed he had just crossed the Atlantic from Montreal in 13 hours, traveling at 300 mph, in a small, homemade submarine, which had sunk off the coast. French authorities were skeptical, noting that they found a one-way Paris-Brest train ticket in his pocket, dated the day before. They took him to a psychiatric ward and later flew him back to Montreal. Papp later documented his supposed transatlantic journey in a book titled The Fastest Submarine.