What do we call the device which is used to locate the submerged objects under sea?

author

Sonar? http://en.wikipedia.org/wiki/Sonar Sep 20 09, 4:02 PM

zbeckabee

From ScienceClarified.com: They sometimes use aerial photographs to get detailed pictures of shallow, clear water. They often use metal detectors or a magnetometer (pronounced mag-neh-TAH-meh-ter) to find metal objects. Sonar devices send waves of sound through the water that bounce off solid objects and return as echoes, which are recorded by electronic equipment. Underwater cameras are regularly used, as are remotely operated vehicles that can penetrate to extreme depths where severe cold, high pressure, and total darkness would prevent humans from going. Finally, before excavating, nautical archaeologists carefully study and map a site (the location of a deposit or a wreck). This is probably the most time-consuming part of the job, as each artifact is drawn on a map to note its exact location. Only after the entire site is mapped will removal begin. http://www.scienceclarified.com/Mu-Oi/Nautical-Archaeology.html Sep 20 09, 9:32 PM