The US Navy's water combat fleet is operating 16 types of ships, including 11 super carriers, 60 destroyers, 22 cruisers and many other warships.
China has just launched the first self-closing aircraft carrier being completed at Dalian shipyard.
Special construction materials, with unique aerodynamic design combined with water jet engines, help Virginia submarines operate much more smoothly than competitors.
The US Navy conducted secret tests on sharks to turn them into self-exploding torpedoes when swimming near the target.
Clint Emerson, a former Navy Navy SEAL commander, teaches the skills you can apply to defend yourself in the event of a dog attack.
In order to spy on the enemy at sea, the US Navy developed a robot shaped like a shark.