Submarine

A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. Submarines have been used by many navies around the world and have played important roles in history, especially during World War I.

Submarines serve many purposes. In the military, they can attack enemy ships, protect aircraft carriers, gather intelligence, and support land attacks. In civilian life, they help with marine science, salvage, exploration, and even tourism. Some submarines are very small, while others, like the Russian Typhoon class, are among the largest ever built and can stay underwater for many months.

Most submarines have a cylindrical body with special ends and a tall structure in the middle that holds important equipment like periscopes. They move underwater using a propeller or pump jet at the back and can change their depth by adjusting water in special tanks called ballast tanks. These amazing vehicles allow us to explore and work in the deep ocean, far beyond where people can swim.

History

Main article: History of submarines

The word submarine means 'underwater' or 'under-sea'. As a noun, it generally refers to a vessel that can travel underwater. Submarines are usually called boats rather than ships, regardless of their size.

In the 16th and 17th centuries, people began designing and building early submarines. These were small, human-powered vehicles that could dive and surface. One early example was a submarine built in 1620 by Cornelis Drebbel, which used oars for movement.

By the mid-18th century, inventors had begun using ballast tanks to control how deep a submarine could go. In the 19th century, more advanced submarines appeared, including the Turtle in 1775, which was the first to use screws for propulsion, and Nautilus in 1800, which was human-powered. During the American Civil War, the H. L. Hunley became the first military submarine to sink an enemy ship.

In the 20th century, submarines became powered by engines and electricity, making them faster and able to stay underwater longer. This led to their use in both World War I and World War II, where they played major roles in naval warfare. Submarines continue to evolve with new technologies, including nuclear power, allowing them to operate for extended periods far from any port.

Usage

Military

During World War II, submarines were mainly used to attack ships, either on the surface with guns or while submerged using torpedoes. They were very effective at disrupting enemy shipping and supply routes. Submarines were also used for special missions, like dropping off or picking up spies, gathering information, and even rescuing pilots who had to land their planes on the water.

After World War II, new technologies allowed submarines to hunt each other more effectively. They could also launch missiles that could reach faraway targets on land or at sea. Modern submarines are designed to stay hidden underwater, making them hard to detect and attack.

Civilian

While most submarines are used by militaries, some are used for peaceful purposes. These include tourism, exploring the ocean, checking oil and gas platforms, and surveying pipelines. Tourist submarines take people to see underwater reefs and other interesting sites. Some submarines are also used for illegal activities, such as smuggling drugs.

Polar operations

Submarines have been used in cold and icy waters for many years. They have traveled under ice in the Arctic and Antarctic, reaching the North Pole and mapping the ocean floor. These missions help scientists understand the polar regions and test how well submarines can operate in challenging conditions.

Technology

Modern submarines are designed to operate underwater with specialized technology for buoyancy, control, and propulsion. Submarines use ballast tanks to control their depth by adjusting water and air levels. They also have control surfaces like diving planes to steer underwater.

Submarines have different hull designs to reduce drag and noise while submerged. Some use a single hull, while others have an outer hull for shape and an inner pressure hull to withstand deep-sea pressures. Propulsion methods vary, with early submarines using human power or compressed air, and modern ones using diesel-electric systems, nuclear power, or advanced batteries. Armament includes torpedoes, which have evolved from simple devices to advanced guided missiles, and some submarines can also lay mines or launch cruise missiles. Sensors like sonar help submarines detect targets while navigation systems such as inertial guidance and GPS keep them on course. Life support systems provide oxygen, manage air quality, and handle waste, allowing submarines to stay submerged for extended periods.

Crew

A typical nuclear submarine has a crew of over 80 people, while conventional submarines usually have fewer than 40. Life on a submarine can be challenging because crew members must work in isolation for long periods without contact with family and in tight spaces. Submarines often stay quiet to avoid being detected.

For many years, most navies did not allow women to serve on submarines. The Royal Norwegian Navy was the first to allow women on submarine crews in 1985, followed by others like the Royal Danish Navy, Swedish Navy, and Royal Australian Navy. In 2011, the UK decided to allow women on submarines starting in 2013. The US Navy also began allowing women on submarines in 2010. Today, several navies permit women to serve on submarines, though pregnant women are still generally not allowed due to health concerns.