to be retired, NASA decided to continue operations with the existing tanks. Therefore, to reduce the risk of failure and the cumulative effects of load, the vessels were maintained at 80 percent of the operating pressure as late in the launch countdown as possible, and the launch pad was cleared of all but essential personnel when pressure was increased to 100 percent. The new launch procedure was employed during some of the remaining launches of Atlantis, but was resolved when the two COPVs deemed to have the highest risk of failure were replaced. Window damage After the STS-125 mission, a work light knob was discovered jammed in the space between one of Atlantiss front interior windows and the Orbiter dashboard structure. The knob was believed to have entered the space during flight, when the pressurized Orbiter was expanded to its maximum size. Then, once back on Earth, the Orbiter contracted, jamming the knob in place. Leaving "as-is" was considered unsafe for flight, and some options for removal (including window replacement) would have included a 6-month delay of Atlantiss next mission (planned to be STS-129). Had the removal of the knob been unsuccessful, the worst-case scenario was that Atlantis could have been retired from the fleet, leaving Discovery and Endeavour to complete the manifest alone. On June 29, 2009, Atlantis was pressurized to (3 psi above ambient), which forced the Orbiter to expand slightly. The knob was then frozen with dry ice, and successfully removed. Small areas of damage to the window were discovered where the edges of the knob had been embedded into the pane. Subsequent investigation of the window damage discovered a maximum defect depth of approximately , less than the reportable depth threshold of and not serious enough to warrant the pane's replacement. Gallery Tribute and mission insignias * Mission canceled following the Challenger disaster. In media The 1986 film SpaceCamp involves a crew of students at United States Space Camp that are accidentally launched into space on-board Atlantis. The 1990 novel Earth by David Brin includes Atlantis, depicted as stranded on Rapa Nui in tribute to G. Harry Stine's serialized novel Shuttle Down, published in 1980. Atlantis is featured in, and destroyed in, the 1998 science-fiction films Deep Impact and Armageddon. Atlantis is the setting and title of episode 2 of season 1 of the revived continuation of the TV series Quantum Leap, which features a fictional