Submarines
⭐ MasteredSubmarines travel underwater by filling and emptying tanks with water to dive or rise. They are used for exploring, research and defence.
Some research submarines can dive thousands of metres.
All about Submarines
A submarine travels underwater by filling and emptying ballast tanks with water. When the tanks are full, the submarine sinks. When they are emptied of water and filled with air, it rises. Propellers and fins control its direction and depth.
Submarines were first used in the 1600s and developed quickly in the 1800s and 1900s. Modern submarines are used for exploring the deep ocean, conducting research and for national defence. Some can stay underwater for months.
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Real-life uses of Submarines
- Exploring the deep ocean
- Carrying out scientific research under the sea
- Mapping the seabed
Frequently asked questions about Submarines
How do submarines breathe?
Diesel submarines surface to run engines and recharge batteries. Nuclear submarines can produce oxygen from seawater for long periods.
What is a periscope?
A tube with mirrors or lenses that lets people on a submarine see above the water when it is near the surface.
How deep can submarines go?
Military submarines can go very deep, while research submersibles can reach the deepest parts of the ocean.