Submarines submerge and surface by changing the average density of the hull.
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Submarines had an important role in naval warfare as early as World War I.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
Due to their asymmetrical profile of the wings, lift is produced while flying at a high speed.
A hot air balloon is a balloon aircraft which is lifted by hot air.
The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.
The medieval Arab inventor, Hassan Al Rammah designed the world's first operating torpedo.
This animation demonstrates Sir Isaac Newton's three laws of motion that laid the foundation for classical mechanics.
Christopher Columbus' three-masted carrack, the Santa Maria was the flagship of his first, landmark voyage.
RMS Titanic was the largest passenger ship at the beginning of the 20th century.
The animation shows the way forces act on wheeled vehicles and vehicles with runners.
The French Montgolfier brothers were the first pioneers of flying.
Hovercraft are capable of travelling at high speed above the surface of water.
The boundaries of tectonic plates can be seen on the seafloor.
This animation demonstrates the most important seas and bays.