NASA said Tuesday night that it had recovered a videotape showing four of the Columbia astronauts in the last minutes of their flight just before things went awry.

　　The 13 minutes of tape, which includes the space shuttle's flight over the Pacific just before problems developed, shed no light on what went wrong, said an official close to the investigationsintosthe Feb. 1 disaster. The astronauts are seen doing routine tasks in the cockpit, like putting on their gloves, and casually chatting, the official said.