To become a qualified submarine soldier, you must pass the cultural test, psychological test and oxygen allergy test, and pass the three islands.

The education level determines whether the professional knowledge can be learned well, and the psychological quality determines whether the submarine can be done well. Oxygen allergy test is a supplementary test of physiological function. After various tests, the elimination rate is about 10%. During the training, each student will be assigned a major corresponding to the submarine model, such as fish, water and thunder, rudder signal, radar, sonar, marine engineering and so on. The degree of knowledge integration between these majors is very small, and the majors they study determine the future jobs and combat sequences of the students on the submarine, which is irreplaceable and unchangeable.