The Apollo contract specified a shirt-sleeve environment. For this reason, North American was told not to include in its design a hatch that opened by explosives, like Mercury’s. An accidentally blown hatch in space would cause an instant vacuum and certain death for an astronaut not wearing his pressure suit.

Space Rocket History #110 – Early Apollo Command Module Design

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Just before the mission began things started to go wrong. The weekend before launch Charlie Duke, the backup lunar module pilot, came down with a case of German measles.
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Space Rocket History #259 – Apollo 13 – Introduction – Part 2

Targeted for touchdown on the third lunar landing was a place known as the Fra Mauro range, a stretch of rugged, Appalachian-type mounds 110 miles east of the Apollo 12 landing site.
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Space Rocket History #258 – Apollo 13 – Introduction – Part 1

Ten days ago, their Saturn V rocket had blasted Bean and his crew mates out of earth’s gravitational pull. Now their home planet was pulling them back at more than 24,000 miles per hour, twelve times faster than a high-speed rifle bullet. “Boy,” said Bean, “we are really hauling!”
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Space Rocket History #257 – Apollo 12 – Return, Re-entry and Splashdown

Dick Gordon opened the tunnel to Intrepid, saw his companions floating in a dirty cloud of moon dust, and slammed the hatch closed. He called out, “You guys ain’t gonna mess up my nice clean spacecraft!”
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Space Rocket History #256 – Apollo 12 – Leaving the Moon

After a total of 31.6 hours on the moon, the Lunar Module ascent stage fired for about 7 minutes placing Intrepid into an orbit of 10 miles by 54 miles.
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Space Rocket History #110 – Early Apollo Command Module Design

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