Crew members of the attack submarine USS Pogy (SSN 647) assemble a topside deck enclosure to provide protection from the Arctic elements after the sub surfaced through a 6 inch thick layer of Arctic ice flow. The submarine is on a 45-day research mission to the North Pole. Seven scientists and technical advisors are conducting experiments and collecting samples for studies in water mass properties, geophysics, ice mechanics and pollution detection in the Arctic Ocean. The research voyage is the second of five planned deployments through the year 2000.