"Columbia" passed over California at 8:53. Video shows flashes happening and an unusual trail left behind "Columbia", which even hobbyist watchers saw as out of the ordinary. At this point, the temperature of the damaged part of the wing was around 3,000°F (1,650°C). By 8:58 "Columbia", still moving at incredible speeds, crossed from New Mexico into Texas, at which point it began shedding debris. By this point several temperature sensors in the damaged left wing had stopped working, and one of the flight controllers reported that the tyre pressure sensors on that side were reporting "off scale low" - meaning the pressure was so low that the sensors could not read it, or in other words the tyres had melted and no longer contained air. The last communication with commander Rick Husband was ""Roger, uh bu-"" at 8:59. 45 seconds later, video from the ground shows "Columbia" breaking apart. Mission Control began its disaster procedures at 9:12. 