I felt the wall of the tunnel shiver. The master alarm squeals through my earphones. Almost simultaneously, Jack yelled down to me that there was a warning light on. Fleeting but spectacular sights snapped into ans out of view, the snow, the shower of debris, the moon, looming close and big, and the dazzling sunshine for once unfiltered by layers of air. The last twelve hours before re-entry were particularly bone-chilling. During this period, I had to go up into the command module. Even after the fiery re-entry splashing down in 81° water in the south pacific, we could still see our frosty breath inside the command module.