Drown-Proofing
Drown-proofing is the BUD/S water competency evolution, where a candidate stays relaxed and working in the water with their feet bound, then their hands, then both. Naval Special Warfare Center instructors describe it as a crawl, walk, run progression with a safety layer at every step.
The Progression
The center's own water competency training walks through the order of it: the feet are tied first, then the hands, then both together, and the candidate is asked to perform a series of tasks in the water, including bobbing, floating, traveling, recovering a mask from the bottom of the pool, and flips. The order is the teaching method. Each step adds one more restriction on a skill the step before it already trained, so the candidate is never asked to do something they have not been prepared for.
How It Is Supervised
The same training sets out the safety layer around the evolution: one instructor for every five students in the water, safety observers above it, a dive medical officer and a corpsman with life-saving equipment, and a vehicle ready to move a candidate in distress to medical care. Candidates are told they can call a training timeout at any point to raise a safety concern. The evolution is run by instructors who have done it many times, on a progression, with the pool watched from more than one place.
Where It Comes From
Drown-proofing is not a BUD/S invention. It is a Navy water survival skill with its own standard test, which NAVEDTRA 132 sets out as a basic survival stroke for five minutes, then the modified stroke with the ankles tied, then the modified stroke with the hands behind the back, five minutes each. BUD/S runs its own version of the same idea under instructors, and the reason the center gives for it is not fitness. It is the confidence that comes from having been restricted in the water before it happens for real, tied up in a line or tangled in gear.
Practise the calm part: slow exhales, a float you can find without your hands, one breath at a time. Panic is the failure mode, not fatigue.
Related Terms
The combat sidestroke (CSS) is a hybrid swimming technique developed for military applications that combines elements of sidestroke, freestyle, and breaststroke. It is the preferred stroke for the PST 500-yard swim and the primary swimming technique used throughout BUD/S training and NSW operations.
First Phase is the seven-week opening block of BUD/S, the phase that selects and prepares candidates physically and psychologically for the rest of the pipeline. It holds Hell Week, and it is where most of a BUD/S class is lost.
The 500-yard swim is the first event of the Physical Screening Test (PST) and measures a candidate's aquatic endurance. Performed using either the combat sidestroke (CSS) or breaststroke, it tests the sustained swimming capacity required for BUD/S water-based evolutions.
The Long Slow Distance swim is the Thursday cardio session in the 26-week NSW preparation program. It is a continuous swim at a low to moderate intensity, and its distance grows by 100 yards every week, from 1,000 yards in week 1 to 3,500 yards in week 26.
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