Underwater writing slates were used to record the different species adhering to the top, side and interior roof of pipes over time. Counting the interior surface of pipes took considerable flexibility on the part of the diver.
Photo Category: Coral Reefs - Marine Biologist - Artificial Reef - Diving
Photo Location: Pokai Bay, Oahu
Photo Date: August 1969
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| Added On | 19th October 2015 |
| Viewed | 9 viewed |