As the construction continued on the International Space Station (ISS), STS-118 Astronaut Rick Mastracchio and Canada Space Agency's Dave Williams (out of frame), participated in the first session of Extra Vehicular Activity (EVA) for the mission. During the 6 hour, 17 minute space walk, the two attached the Starboard 5 (S5) segment of truss, retracted the forward heat rejecting radiator from the Port 6 (P6) truss, and performed several get ahead tasks.