sonar

River searches had taken place since Ms Taylor was reported missing on 1 October, including the use of divers and specialist sonar equipment.

The group is working together with tribes and state and federal agencies on a monitoring program, and scientists are using a newly installed sonar station to record images of passing fish.

County Lifeguards Marine Technical Search Team is using drones to search from the air and sonar techniques to search in the water, he said.

Teams are conducting searches both above and below the water's surface, with those involved using specialist sonar equipment.

Others, like dolphins and whales who use sonar for navigation, will be deafened.