Submarines are a strategic weapon of the country and an important guarantee of national security. Faced with repeated intrusions by the "Black Shark" attack submarine of Country X, the Navy quickly formulated the "T Plan" and launched a nationwide special recruitment to train command officers for a new type of submarine under development. A group of post-90s college students have been screened and entered this mysterious submarine world. In the extraordinary and harsh training, they have grown from ignorant recruits to iron-blooded soldiers shouldering the heavy responsibility of national defense. They have driven our army's new submarines to deep-sea diving, repeatedly driving away the reconnaissance and harassment of the "Black Shark" class submarines of Country X, and safeguarding the security of our territorial waters. Under the strong leadership of our party, the enemy was terrified. They have gone through the test of life and death, and built a mobile Great Wall for our thousands of miles of sea borders with their lives and blood, practiced the "heavy sword" spirit of shedding blood on the sea borders, and defended the immortal oath of "obeying the command of the party, sharing life and death, and never sinking."