What is pool comp in Navy SEAL training?

The "pool comp" in Navy SEAL training refers to pool competency, a core underwater test within the Basic Underwater Demolition/SEAL (BUD/S) training. It involves methods of drown-proofing and handling underwater pressure while executing tasks like tying knots or managing gear. Often cited as one of the most challenging parts of SEAL training, pool comp primarily tests a candidate's composure under water and under duress.

This training evolution is notoriously difficult, and many candidates are known to fail on their first attempts, frequently necessitating retesting. For instance, both Jocko Willink and Dan Crenshaw described failing pool comp initially before successfully passing in subsequent attempts. They emphasized the mental challenge of remaining calm under stress during these underwater tests 1.