SIGONELLA, Sicily (NNS) -- In remembrance of the trials and tribulations of the crew of USS Indianapolis (CA 35), a group of 10 Naval Air Station (NAS) Sigonella Sailors plunged into the NAS II pool for 12 hours of treading water July 28. Beginning at 6 a.m. and concluding at 6 p.m., the Sailors participated in the USS Indianapolis Endurance Challenge, held in honor of the 317 survivors of Indianapolis who tread water for four days after their ship was sunk before finally being rescued. Indianapolis was commissioned in 1932. She became the flagship for U.S. 5th Fleet during World War II. The heavy cruiser received 10 battle stars for her numerous engagements. July 26, 1945, she delivered the world’s first operational atomic bomb to the island of Tinian.