Compared to the unlucky Joe Ga, Nis and Antar performed unexpectedly well.
Their physical fitness was not the best, but their years of constant high-pressure combat had honed their psychological adjustment abilities, mental resolve, and body control far beyond those of Joe Ga, the boss.
This training had no time limit. Its purpose was not to compete over strength but to teach people to control their emotions and develop their stress resistance skills.
The most typical was the initial self-rescue drill, the surfacing part. It seemed straightforward, but it required trainees to control their instinct to breathe deeply. Breathing too deeply would cause trouble when sinking, and sinking too slowly would make you feel like you were drowning after a few rounds.
This first drill was so challenging that Joe Ga felt that the quick checks and diving equipment training during daily breaks were no longer hard.