sonar
The modern tools includes several forms of sonar(detection by sound reflection).
Sonar
They use a Sonar system.
A device commonly used to locate objects underwater is a sonar system, such as a side-scan sonar or a multibeam sonar. These devices emit sound waves into the water and then receive the echoes bouncing back from objects underwater, creating a detailed image of the seafloor or any objects present.
Scientsts use sonar to map the depth of water in sea and river etc..,they also use sonar to locate and identify object underwater
So that the city could easily keep an array of ships and boats. Boats are used for a great many things, from fishing to trading to exploring new lands, etc. Without the use of boats, we would not have many of the things we use today, and without a harbour, using boats would have been too difficult for many cities.
German underwater boats, or U-boats, were primarily used during World War I and World War II for naval warfare, specifically to disrupt enemy shipping and trade routes. They targeted merchant vessels and military ships, aiming to sink them with torpedoes and mines. U-boats played a crucial role in Germany's strategy of unrestricted submarine warfare, which sought to weaken Allied forces by cutting off supplies. Their use significantly impacted naval tactics and the course of both wars.
Do boats use sonar. Yes they do.
Dolphins use echolocation to navigate and communicate in their underwater environment because it helps them locate objects, find food, and communicate with other dolphins by sending out sound waves that bounce off objects and return to them, providing information about their surroundings.
Didn't is a combo of Did and Not so you can use it when your saying you did nto do somthing, you didn't do somthing .
I like to swim underwater.