"Lost" is the fifteenth episode of military science fiction television series Stargate Universe. The episode originally aired on April 30, 2010 on Syfy in the United States, and on SPACE in Canada. The episode was directed by, Rohn Schmidt who previously acted as the director of photography in Air. It was written by Martin Gero, a co-executive producer of Stargate Atlantis.In this episode, the off-world team continues its search for a way out of the tunnels. However a collapse traps Sgt.