In 2011, Mississippi sank a retired NASA hydrogen tank as an artificial reef during post-Katrina restoration efforts

Off Pascagoula, in about 85 feet of water in the Gulf, lies a relic of the space race era. In October 2011, conservation engineers sank a ninety-eight-thousand-pound spherical hydrogen tank into the Gulf to serve as an artificial reef. Constructed in the 1960s to hold liquid hydrogen used as fuel for testing of Apollo rockets, it lay unused until transformed into an aquatic habitat.

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