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The Carbon Dioxide Problem in the Apollo 13 Module
In 1970, mission control had no way of sending images of their improvised contraption to the Apollo 13 crew. All they had was a set of carefully written instructions, a radio and descriptive skills of astronaut Joe Kerwin. The carbon dioxide level in the lunar module was gradually going up and it had reached the normal maximum level. They could still breathe but you could see it coming.