Aquarius Reef Base

Aquarius, designed by Perry Submarine Builders of Florida and constructed by Victoria Machine Works, was built in Victoria, Texas, in 1986. Its original name was "the George F. Bond", after the United States Navy physician who was the father of SEALAB in particular and saturation diving in general. Underwater operations were first planned for Catalina Island, California, but were moved to the U.S. Virgin Islands. Following Hurricane Hugo in 1989, Aquarius was taken to Wilmington, North Carolina, for repairs and refurbishment and was redeployed in the Florida Keys in 1993. Aquarius is located under of water at the base of a coral reef within the Florida Keys National Marine Sanctuary, an ideal site for studying the health of sensitive coral reefs. The laboratory is most often used by marine biologists for whom Aquarius acts as home base as they study the coral reef, the fish and aquatic plants that live nearby and the composition of the surrounding seawater. Aquarius houses sophisticated lab equipment and computers, enabling scientists to perform research and process samples without leaving their underwater facilities. The habitat accommodates four scientists and two technicians for missions averaging ten days. Scientists on the Aquarius are often called "aquanauts" (as they live underwater at depth pressure for a period equal to or greater than 24 continuous hours without returning to the surface). A technique known as saturation diving allows the aquanauts to live and work underwater for days or weeks at a time. After twenty-four hours underwater at any depth, the human body becomes saturated with dissolved gas. With saturation diving, divers can accurately predict exactly how much time they need to decompress before returning to the surface. This information limits the risk of decompression sickness. By living in the Aquarius habitat and working at the same depth on the ocean floor, Aquarius aquanauts are able to remain underwater for the duration of their mission. In addition, because Aquarius allows saturation diving, dives from the habitat can last for up to nine hours at a time; by comparison, surface dives usually last between one and two hours. These long dive times allow for observation that would not otherwise be possible. Way stations on the reef outside Aquarius allow aquanauts to refill their scuba tanks during dives. ==Habitat structure==

Aquarius consists of three compartments. Access to the water is made via the wet porch, a chamber equipped with a moon pool, which keeps the air pressure inside the wet porch the same as the water pressure at that depth (ambient pressure), about 2.6 atmospheres, through hydrostatic equilibrium. The main compartment is strong enough, like a submarine, to maintain normal atmospheric pressure; it can also be pressurized to ambient pressure, and is usually held at a pressure in between. The smallest compartment, the Entry Lock, is between the other two and functions as an airlock in which personnel wait while pressure is adjusted to match either the wet porch or the main compartment. This design enables personnel to return to the surface without the need for a decompression chamber when they get there. Personnel stay inside the main compartment for 17 hours before ascending as the pressure is slowly reduced, so that they do not suffer decompression sickness after the ascent. ==Underwater missions and research==

Several missions on the Aquarius have been canceled due to hurricane activity. During Hurricane Gordon in 1994, a crew of scientists and divers had to evacuate Aquarius and climb up a rescue line to the surface in seas after one of the habitat's generators caught fire. In 1998, Hurricane Georges nearly destroyed Aquarius, breaking a joint in one of its legs and moving two weights on the wet porch nearly off the structure. Both Hurricane Georges and Hurricane Mitch, later in 1998, also destroyed way stations outside Aquarius used to refill aquanauts' scuba tanks. In 2017, Hurricane Irma ripped the habitat's life support buoy from its moorings and blew it away to the Lignum Vitae Channel, as well as damaging the underwater living quarters and wet porch area. , no scientists or staff members had been injured at Aquarius due to storms. A diver named Dewey Smith died during a dive from Aquarius in May 2009. A subsequent investigation determined that Smith's death was caused by a combination of factors, including the failure of the electronic functions of his Inspiration closed circuit rebreather due to hydrodynamic forces from a hydraulic impact hammer being used nearby. Due to budget cuts, NOAA ceased funding Aquarius after September 2012, with no further missions scheduled after a July 2012 mission that included pioneering female diver Sylvia Earle in its aquanaut crew. The University of North Carolina Wilmington was also unable to provide funding to continue operations. The Aquarius Foundation was set up in an attempt to keep Aquarius functioning. In a two-week series, the daily cartoon strip ''Sherman's Lagoon'' featured the potential closing of the Aquarius facility in the week starting September 10, 2012, and continued with a cameo appearance of Earle in the week starting September 17, 2012, to discuss the importance of Aquarius. In January 2013, a proposal to keep Aquarius running under Florida International University administration was accepted. ==References==