Squalus (SS-192) When the USS Squalus sank in 240 feet of water in May 1939, the Navy had its first opportunity to test the rescue diving bell under actual emergency circumstances. The crew was trapped inside the stricken submarine at a depth that would have endangered their lives had they tried to escape by using Momsen lungs. The tragic sinking of the Squalus is seen, along with the valiant efforts that saved 33 men. At the end of the program, Vice Admiral Charles B. Momsen, inventor of the Momsen Lung and the supervisor of the Squalus rescue operation, is interviewed.
