USS Trepang (SSN-674), 1985. The sail of the nuclear-powered submarine USS Trepang (SSN-674) protrudes from the ice near Ice Camp Opal, one of three research stations established on the polar ice cap during the Arctic Research and Environmental Acoustic (AREA) program. Area '85 is a Navy-sponsored expedition to study oceanography, acoustics, geophysics, communications and submarine warfare in the polar environment. Crew members are removing ice from one of the ship's hatches, July 5,1985. Photographed by JOC Fred J. Klinkenberger, USN. Official U.S. Navy Photograph, now in the collections of the National Archives.