The water was clear enough that even during a night dive, the divers’ lights could be seen from the surface.
Night Lights
Image courtesy of the Search for the Lost French Fleet of 1565 Expedition, NOAA-OER/St. Augustine Lighthouse & Museum. Download larger version (jpg, 58 KB).

The water was clear enough that even during a night dive the divers’ lights could be seen from Roper upon the surface.

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