English: Astronaut James F. Reilly participates in a bit of space history as he joins astronaut Michael L. Gernhardt (out of frame) in utilizing the new Quest airlock for the first ever space walk to egress from the International Space Station (ISS). The two STS-104 mission specialists were scheduled to attach a fourth and final supply tank to the airlock’s exterior, and move on to some get-ahead tasks made possible when they were able to attach a bonus third tank during an earlier space walk. Tasks added to the final space walk include an inspection of one of the station’s solar array swivels and inspection of the Floating Potential Probe that measures plasma levels around the solar arrays. The image was recorded with a digital still camera.