During emergency egress STS-120 Mission Specialists Stephanie Wilson settle in the slidewire basket.

During emergency egress from Launch Pad 39A, STS-120 Mission Specialists Stephanie Wilson (left) and Doug Wheelock settle in the slidewire basket. The basket can carry them to a safe landing site below, if needed. The activity is part of the prelaunch terminal countdown demonstration test, or TCDT. The TCDT at NASA's Kennedy Space Center provides astronauts and ground crews an opportunity to participate in various launch preparation activities, including equipment familiarization and emergency training. The STS-120 mission will deliver the U.S. Node 2 module, named Harmony, aboard space shuttle Discovery to the International Space Station. Discovery is targeted to launch on its 14-day mission at 11:38 a.m. EDT on Oct. 23. Photo credit: NASA/Kim Shiflett