Liu Sheng and Li Huaqun reported: "Battle alert!" On the spring day in the Northern Kingdom, a certain sea area was swept by waves. The submarine stationed at a naval base in the Northern Theater pulled out its anchor and set sail amid the sound of an alarm, quickly turned into combat mode, and went to a certain sea area for a long endurance drill. Detected suspicious signal! "The submarine had just arrived at the designated sea area, and the special situation suddenly arrived. The screen in the cabin flickers and data flows. The radar soldier stares closely at the display screen, carefully identifies the radar signal, and quickly identifies and reports the target after eliminating interference signals and false targets. "Quick dive, keep tracking the signal!" Captain Ao Junjie immediately issued a command to command the submarine to quickly maneuver and evade. The rudder signal technician was skilled in operation, and the mechanical and electrical department cooperated closely to successfully handle the special situation. The leader of the base introduced that during this training, they randomly set up a practical "enemy situation" to conduct a comprehensive test on the commander's operational planning, force utilization, and other aspects, so as to improve their operational command ability. Special and dangerous situations continue, and trials follow closely. Multiple difficult and dangerous subjects such as cabin sealing and firefighting, leak sealing and anti sinking, and three-dimensional strikes against the enemy are being carried out alternately, comprehensively refining the professional skills of submarine officers and soldiers, deeply tapping the potential of existing weapons and equipment, and further enhancing the emergency response ability of the army. After the drill, the "Deep Sea Sword" continued to dive into the ocean and shift to another sea area for the next stage of the drill. (Liao Xinshe)