The modern tools includes several forms of sonar(detection by sound reflection).
Sonar
They use a Sonar system.
an instrument that use echolocation to locate objects
SONAR
Sonar uses echoes to locate objects by bouncing sound waves off them and detecting the echoes.
Something called echo-location
They use echolocation. They have excellent hearing and eyesight as well.
They use Sonar to send sound waves to the bottom of the oceans.
it seems humans use echolocation to find certain specific things they really need or objects and mainly sound
SOund Navigation And Ranging. Its used mainly to detect underwater objects.
Scientsts use sonar to map the depth of water in sea and river etc..,they also use sonar to locate and identify object underwater