That particular pic was taken in Truk lagoon in the Pacific. Yep. Parts of that dive are only 50-75 feet deep. Some of the wrecks are deeper. It was a large Japanese forward naval base, and One of our carrier task forces went in and blew the living daylights out of anything that moved. Some of those wrecks still have live ordinance on board. Its easy to tell how deep a pic is taken by the colors visible on the dive equipment. Anything below 50 feet or so, and reds and yellows become more gray when viewed in natural light, which at that depth, starts to dim.