A Coast Guard diver relays vital oxygen and depth readings to the dive supervisor on the Coast Guard cutter George Cobb during dive training in the waters off the coast of San Pedro, Calif., April 22, 2015. A Coast Guard diver relays vital oxygen and depth readings to the dive supervisor on the Coast Guard cutter George Cobb during dive training in the waters off the coast of San Pedro, Calif., April 22, 2015. SHARE: Download: Full Size (5.89 MB) Tags: Photo Essays Credit: VIRIN: 891510-P-SRX38-792.jpg Photo Gallery