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This is an analogue of Tracy Kidders The Soul of a New Machine applied to the Apollo project, specifically to the aerospace engineers at North American Aviation who worked on the second stage of the Saturn V rocket and on the Apollo Command and Service Module. They built amazing things! The second stage of the rocket carried liquid hydrogen and liquid oxygen; the two should never come into contact, since the boiling points of the two gases are 70 Kelvins apart. Instead of installing two separate tanks, the stage had a common bulkhead with a honeycomb plasticized synthetic cloth structure for insulation. There were no standard manufacturing techniques for forming curved metal sections of the bulkhead, so the engineers formed them with underwater explosions. A huge vacuum bell lifted the bottom of the liquid hydrogen tank over the honeycomb. They tested that the two metal sheets were bonded to the honeycomb by transmitting high-frequency sound through a water jet; on the other side, a receiver picked up the sound through another water jet. The 10-meter-diameter stage had welds that had to be accurate to the third of a millimeter. When they were building the command module, they anticipated that one parachute out of three might fail (which actually happened on the Apollo 15 mission); if the capsule hit the quiet sea bottom-on, it might break apart and sink. Instead of beefing up the capsule, the engineers did a Monte Carlo simulation with different height of waves, speed of waves, angle of the capsule during the splashdown, and so on; they realized that the worst case was very unlikely, and did not change the capsule.These people were working 60-hour weeks; they knew that it was the time of their lives. The wife of one engineer divorced him because she and the kids never saw him awake; the judge said, No man could work that hard. The wife of the chief engineer emptied several tranquilizer bottles; after she recovered, he bought her an 8,300-square-foot mansion as a sign of remorse. He later had a heart attack.The anticlimactic point of the book is the fire in the command module during a launch pad test of the Apollo Saturn-204 mission, later redesignated Apollo 1, which killed three astronauts. Because of corporate miscommunications, the people testing flammability did not realize that just before and after launch, the capsule would be filled with pure oxygen at slightly higher than atmospheric pressure! The chief engineer was fired, the capsule was redesigned, and the Apollo project proceeded.
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