Weakness

Following a brutal first stage, only 20 of the original 30 civilians remain and the directing staff ratchet the intensity up a notch, applying pressure to isolate and expose individuals who they think are not up to it.

The remaining recruits must choose their weakest colleagues, who then lead the next exercise. And there's the 'Sickener': a series of physical challenges that won't end until five recruits give up.

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S01E03 - Fear