"Gabe Newell has a significant interest in yachts, notably purchasing the yacht builder Oceanco and taking delivery of his $500 million superyacht, the Leviathan. The Leviathan is a 364-foot vessel with a unique design that includes a hospital, a gaming deck with 15 PCs, a submarine garage, and hybrid propulsion. He also lives full-time at sea and is involved in marine research through his organization, Inkfish, which operates a fleet of research vessels."