Page last updated at 18:23 GMT, Tuesday, 16 December 2008

25,000 ft with no oxygen mask

Jason Palmer experiences being at the equivalent of 7,620 metres (25,000 feet) above earth then taking off his breathing mask.

Tim D'Oyly from military research and training establishment QinetiQ gave him a series of tasks to show how oxygen starvation, or hypoxia, affects the body.

QinetiQ carries out such tests on fighter pilots to instruct them on the effects of oxygen starvation.

They also use the chamber to test life-support systems for high-flying jets such as the Typhoon.

The safety systems are designed to spring into action in the event of sudden depressurisation.

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