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sound waves
Submarine technology, sonar technology, and underwater-robot technology
Robotics is one such technology used today.
Sonar
A sub spotter is typically called a Submarine Sonar Technician or Sonar Operator. Their role is to detect and locate enemy submarines using sonar technology.
SONAR
Sonar
Multibeam sonar technology is a offshore surveying tool used by hydrographic surveyors in navigational charting. It is primarily used in the fields of geology and oceanography.
sonar
bats
To find out the ocean`s depth
sonar