Straight to the bottom of the ocean.
U.S. Submarines can dive 800-plus feet. (Official depth; however, can dive deeper. The US Navy itself acknowledges that most of it's attack submarines can operate down to at least 985 feet, and many to over 1400 feet.
Yes, submarines can operate on the surface of the water. While they are primarily designed for underwater navigation, they can surface to recharge batteries, conduct operations, or allow crew members to breathe fresh air. When on the surface, submarines resemble conventional ships but retain the capability to dive and operate underwater as needed.
Naval submarines do not dive deep enough to go near underwater mountains. This is contrary to what you may have seen in the movies. They use sounding charts to determine the depth of the water in which they are navigating. They avoid such underwater objects. Research submarines use cameras and sonar, as well as charts, to guide them.
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Submarines?
Submarines move through water using a combination of buoyancy and propulsion. They adjust their buoyancy by taking in or expelling water from their ballast tanks, allowing them to dive or surface. For propulsion, submarines typically use diesel-electric or nuclear power systems that drive propellers, enabling them to navigate underwater and on the surface. By controlling these elements, submarines can maneuver effectively in various underwater conditions.
Submarines have sonars.
People need a submarine or dive bell to protect themselves from the immense pressure experienced at deep underwater levels. Submarines and dive bells are designed to withstand high pressures and provide a controlled environment for divers to safely explore these depths without risking injury or death.
Use Dive.
They are called submarines
Ironclads are not the same thing as submarines. Ironclads do not go underwater completely even though the majority of their body may be underwater.
Submarines can stay underwater for extended periods, often ranging from several days to weeks, depending on their type and technology. Nuclear-powered submarines can remain submerged for months at a time, limited primarily by food supplies and crew endurance. Conventional diesel-electric submarines typically have shorter underwater endurance, often around a week, due to the need to surface for air or recharge batteries. Advances in technology continue to enhance the underwater capabilities of submarines.