Am watching 'man on the moon' on YouTube. I was always under the impression that death within the capsule was fairly quick. But in this special it was described that an oxygen tube broke lose and was whipping around the capsule, nearly decapitating one of the crewmen. Then the 'witness' said 'it was a horrible 90 seconds before the crewmen lost consciousness' . I gotta say that, looking at pictures of the burned suits of the crewmen, that this 'theory' makes a lot of sense.