As Operations Manager at Aquarius for the National Undersea Research Center, Cooper supervised the daily activities of the underwater habitat. He also served as Coast Guard-licensed Captain, Diving Medical Technician, and habitat technician during missions aboard Aquarius. Cooper commented of the scientists participating in a June 1995 marine biology mission aboard Aquarius, "In many ways this is like a space mission... We need to keep a close eye on them to make sure everything's okay." During Hurricane Gordon in 1994, Cooper helped rescue a crew of scientists and divers who had to evacuate Aquarius and climb up a rescue line to the surface in 15-foot seas after one of the habitat's generators caught fire. As of 2008, no scientists or staff members had been injured at Aquarius due to storms. In July 2004, Cooper took part as a habitat technician in the NASA Extreme Environment Mission Operations 6 mission, one of a series of NASA-NOAA missions which use Aquarius as an analog environment for space exploration. The NEEMO 6 crew lived and worked underwater aboard Aquarius for ten days. In April 2005, Cooper served as a habitat technician during the mission, the crew of which lived underwater for three days. Other missions aboard Aquarius in which Cooper has participated include a June 2006 mission with the U.S. Navy Specialized Research Diving Detachment during which NURC divers investigated the possibility of using rebreathers during excursions from Aquarius. During the investigation of the death of Aquarius aquanaut Dewey Smith in 2009, the panel of outside experts asked Cooper to organize a test in which the hydraulic hammer in use near Smith at the time of his fatal accident was again used underwater in the vicinity of an Inspiration closed circuit rebreather similar to the one Smith had been using. Cooper is a friend of SEALAB aquanaut Bob Barth, whom he regards as a mentor. In 2003, Cooper, Barth, U.S. Navy Supervisor of Diving Captain Mark Helmkamp and NOAA Captain Craig McLean organized a partnership allowing Navy divers to take part in Aquarius saturation diving missions. In a blog entry written in 1999, Cooper wrote of his fellow Aquarius topside personnel and habitat technicians, "If the scientists are the astronauts, these guys are the junior Bob Barths." After leaving the Operations Manager position in 2009, Cooper continued serving with Aquarius in his capacities as diver, medical technician and habitat technician, as well as working on program development and collaborations with other agencies. In March 2010, Cooper retired as Operations Director of Aquarius. At Cooper's retirement ceremony, Barth commented, "You're the only one, don't be the last!" Cooper subsequently joined the team of retired University of Connecticut professor Richard A. Cooper, who hopes to build an undersea lab called SeaBase 1 in the Belize Barrier Reef.
