Cornelius Drebbel, a Dutch inventor, built the first working submarine in 1620. His submarine, powered by oars, was able to submerge for a short period of time.

The H.L. Hunley, a Confederate submarine, successfully sank the USS Housatonic in 1864, becoming the first submarine to sink an enemy ship.

The United States developed the first nuclear-powered submarine, the USS Nautilus, in 1954. The Nautilus was able to travel underwater for extended periods of time without surfacing, revolutionizing submarine warfare.

The deepest a submarine has ever dived is 10,902 meters, achieved by the Japanese research submarine Shinkai 6500 in 1995.

The German submarine U-20, commanded by Kapitänleutnant Walther Schwieger, sank the RMS Titanic on April 15, 1912, resulting in the deaths of over 1,500 people.

The primary purpose of a ballistic missile submarine is to launch nuclear missiles from underwater, providing a second-strike capability in the event of a nuclear attack.

The USS Nautilus, commanded by Commander William R. Anderson, became the first submarine to reach the North Pole on August 3, 1958.

The Typhoon-class submarine, also known as the Project 941 Akula, is the largest submarine ever built. It was developed by the Soviet Union and entered service in 1981.

The USS Triton, commanded by Commander Edward L. Beach, became the first submarine to circumnavigate the globe underwater in 1960.

The primary role of a nuclear-powered attack submarine is to conduct anti-submarine warfare, including hunting and destroying enemy submarines.

The USS Holland, commanded by Lieutenant Harry S. Knapp, became the first submarine to successfully complete a transatlantic crossing in 1900.

The maximum speed a submarine can achieve is approximately 50 knots, although most submarines have a top speed of around 20-30 knots.

The HMS Porpoise, a British submarine, was the first to be equipped with a snorkel in 1927. The snorkel allowed submarines to run their diesel engines while submerged, increasing their underwater endurance.

The average depth at which submarines operate is around 200 meters, although they can dive much deeper if necessary.

The USS Nautilus, commanded by Commander William R. Anderson, was the first submarine to be equipped with a nuclear reactor in 1954.