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Early hard hats were heavy in air, but buoyant underwater. Picture

Early hard hats were heavy in air, but buoyant underwater.

Early hard hats were heavy in air, but buoyant underwater.

Photo Category: Undersea Technologies - Tethered Divers

Author: OAR/National Undersea Research Program (NURP)/ NOAA

License: Public Domain Mark 1.0 (Public domain)
640 x 434 55.70 KB
1280 x 867 168.13 KB
1784 x 1208 330.79 KB
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Added On
19th October 2015
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