Nasa on Tueday released a report detailing the final moments of the Columbia sparecraft which disintegrated on 1st February 2003.

Seven astronauts, including Indian-born aerospace engineer Kalpana Chaula, who was a mission specialist in the Columbia mission, killed in the accident.

Nasa's 400 page report says that even though the crew members tried their best to maintain control of their vehicle, it was not ultimately survivable.

The crew had lost control of the motion and direction of the spacecraft, the cabin lights were out, and parts of the shuttle behind the crew compartment, including its wings, were falling off and alarms were going off simultaneously.

Finally they lost the cabin pressure and eventually the cabin broke up, unconscious or dead crews crashed into objects in the module.

"It was a very disorienting motion going on," Nasa deputy associate administrator Wayne Hale said in a telephone conference call. "There were a number of alarms going off simultaneously. The crew was trying very hard to regain control. We're talking about a brief time in a crisis situation."

Also, the report found that while crew members were wearing their pressurized suits, one astronaut did not have on a helmet, three were not wearing gloves and none lowered the visors before the module lost cabin pressure. One astronaut also was not seated.

The Nasa study team is recommending 30 changes based on Columbia disaster. It also recommends more training about safety precautions and disaster management for astronauts.