(CNN) A 21-year-old Navy SEAL student died during his first week of basic training in California, authorities said. The pool exercise involves treading water and swimming in dive masks and camouflage uniform. Seaman James Derek Lovelace of Crestview, Florida, died Friday after taking part in underwater demolition training in Coronado, California. Trainees take part in the exercise on their first week to determine their competency and confidence in the water, the Navy said. Safety observers noticed he was having problems during the water familiarization exercise and pulled him out of the pool, the Navy said in a statement Tuesday.

Source: CNN May 11, 2016 00:20 UTC