The Mercury Seven were Alan Shepard, Gus Grissom, Gordon Cooper, Wally Schirra, Deke Slayton, John Glenn, and Scott Carpenter.
this post was submitted on 10 Apr 2026
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Iirc, with the Apollo 1 capsule, it wasn't just the O2 environment that was dangerous; the hatch opened inward, so it was impossible to open when the inside was pressurized. Rest in peace Gus, Ed, and Roger.