Diver Brian McNamara descending to the bottom to lay in a transect line and begin probing.
Probing
Image courtesy of the Search for the Lost French Fleet of 1565 Expedition, NOAA-OER/St. Augustine Lighthouse & Museum. Download larger version (jpg, 226 KB).

Diver Brian McNamara descending to the bottom where he and Sam will lay in a transect line and begin probing.

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