Petty Officer 2nd Class Mark Sisson stands the lookout watch while perched high on the sail of the attack submarine USS Pogy (SSN 647). 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. While personnel are out on the ice, a lookout is continuously posted to scan the horizon for polar bear activity. The research voyage is the second of five planned deployments through the year 2000.