Acoustic release
Oceanographic device recovery method / From Wikipedia, the free encyclopedia
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An acoustic release is an oceanographic device for the deployment and subsequent recovery of instrumentation from the sea floor, in which the recovery is triggered remotely by an acoustic command signal.[1]
A typical release consists of the hydrophone (see dark gray cap in the figure), the battery housing (long gray cylinder), and a (red) hook which is opened to release the anchor by high-torque electrical motor.