Sidescan sonar fish, a Klein System 3900, and the Marine Magnetics Explorer Mini-Magnetometer.
Sonar & Magnetometer
Image courtesy of the Search for the Lost French Fleet of 1565 Expedition, NOAA-OER/St. Augustine Lighthouse & Museum. Download larger version (jpg, 424 KB).

The yellow, torpedo-like object is our sidescan sonar fish, a Klein System 3900. The slender orange unit is the Marine Magnetics Explorer Mini-Magnetometer.

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