National Geographic : 1952 Oct
() National Geographic Society 444 Color Flashes in a Cave Left in Darkness Since the Sea Was Formed Captain Cousteau held the camera for this photograph of a Mediterranean grotto 45 feet below Sanary. Groping forward, Jacques Ertaud detonated the flash bulb, then swam back muttering, "I think it was red." Aqualung divers several hundred yards apart communicate by hooting into their mouthpieces. Close up, they convey simple phrases by careful enunciation and tones produced deep in their throats. These rocks are daubed with more delicate shades than an artist's palette. They are coated largely with algae and flat sponges.