The crew practices exiting from the slidewire basket used during emergency egress from the launch pad.

The STS-115 crew practices exiting from the slidewire basket, used during emergency egress from the launch pad. At left is Pilot Chris Ferguson; at right is Mission Specialist Steven MacLean, who is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston