The sidescan sonar is the next device to enter the water.
Sidescan Sonar
Image courtesy of the Search for the Lost French Fleet of 1565 Expedition, NOAA-OER/St. Augustine Lighthouse & Museum. Download larger version (jpg, 357 KB).

The sidescan sonar is the next device to enter the water. The magnetometer, already launched, is attached by its cable to the sidescan, so the sidescan has to be deployed immediately after the mag enters the water.

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