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They quit on the first leg
The 50-meter swim
The 50-meter underwater swim comes on day two of the first phase of training, and everyone knows it is coming. Candidates swim one length of the pool and back without surfacing. It sits just beyond comfortable for a decent swimmer, and people train for years to be ready.
The first length
The first length is the stressful one. After the turn, a committed swimmer realizes how short and quick the rest is. The ones who quit are not physically done yet, but they are mentally done.
Why the gates exist
Instructors build test gates like this into BUD/S, including Hell Week, five and a half days awake, to force a single question about whether someone can keep going through adversity. Trying and failing is fundamentally different from choosing to stop.
Why do people stop before their bodies fail?
Exercise scientist Samuele Marcora has argued that endurance ends when effort feels impossible to sustain, not when the muscles can do no more. In a 2009 study in the Journal of Applied Physiology, volunteers who first did a demanding mental task quit a cycling test about 15 percent sooner than a control group. Their heart rate and other body measures at quitting were no different from the control group's.
Why is Hell Week built around sleep loss?
Hell Week runs about five and a half days, and candidates sleep only a few hours in total while paddling, running, and working in cold water. Sleep deprivation erodes judgment, mood, and tolerance for discomfort, so it exposes how a person behaves when nothing feels easy. Historically, Navy figures have put BUD/S attrition at roughly 70 to 80 percent of those who start. Many of the dropouts come in the first weeks, including Hell Week.
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