171010-N-TW634-172 SAN DIEGO (Oct. 10, 2017) The Los Angeles-class fast attack submarine USS Alexandria (SSN 757) departs the floating dry dock Arco (ARDM 5). Arco is a Submarine Squadron 11 asset, equipped with two wing wall cranes capable of lifting 25 tons each and a ballast pump system able to pump up to 10,000 gallons of water per minute. (U.S. Navy photo by Mass Communication Specialist 2nd Class Derek Harkins/Released)