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Among the many things Mercury astronaut candidates had to go through, they had to go through a sensory deprivation experiment and spend some time in a sensory isolation tank. How long did they have to stay in the isolation tank to qualify?

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Three hours, according to Space Medicine in Project Mercury, p. 55:

  1. Isolation: Subject goes into a dark, soundproof room for 3 hours to determine his ability to adapt to unusual circumstances and to cope with the absence of external stimuli.

There's a picture of Deke Slayton taking the test on p. 56. It's a chair in a dark room; there's no tank.

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  • $\begingroup$ It's kind of hard to see what's going on in that picture! $\endgroup$
    – usernumber
    Commented Aug 18, 2021 at 6:49

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