National Geographic : 1963 May
Tension grips Sea Diver as U. S. Navy Lt. Comdr. Robert Bornmann, medical adviser for the tests, measures the oxygen content in the mixture piped to Ed Link during a 60-foot dive. The successful test preceded Belgian diver Robert Stenuit's record 241/4-hour stay at 200 feet. Anxiety grows after Stenuit starts his ascent. His wife and author Kilbracken (right) reflect concern over a leak age of vital helium from the diver's breathing system. Engineer-mathematician William Marquet makes sure carbon dioxide in the breathing mixture remains at a minimum; yellow cylinders at left contain lithium hy droxide that removes the waste gas from the system. "Bonjour, Robert. Comment ca va?" Mrs. Stenuit ex changes greetings with her diver-husband 200 feet below Sea Diver.Stenuit could hear her perfectly over the inter com, but his speech sounded unintelligible, somewhat like Donald Duck's, because helium in the breathing 720 mixture affected his voice.