There are four tanks of a combined volume of over 20 million gallons fed by a filtration sea water plant capable of delivering 9,000 gallons of water per minute. Tank 1 is an infinite horizon pond which adjoins and overlooks the Pacific, it is a 360,000 square foot concrete pool with a full capacity of 17 million gallons, used for exterior shooting, wet or dry, and consists of three depth levels between 3 1/2 to 40 feet. The tank can be emptied or filled in 40 hours. Alongside is a 162-foot motor driven tower crane, used for constructing film sets, and as a lighting and camera platform. There is a smaller outdoor tank and another two built into an indoor stage. The tank was built to film "Titanic". Fox created a Studio Tour named Foxploration, which opened in May 2001 consisting largely of "Titanic" exhibits, Fox derived displays, and items from other films notably "Master and Commander". This tour closed. U2 Rehearsals for the Vertigo Tour 2005