The challenge of ice adjacent to land and the depth of the water. It shoals considerably around land, and we really haven't had the type of hydrographic surveys done in the north that we've been able to do in other parts of the country. That's some of the research that's going on now that I've talked about already. We're able to keep vessels safe in the areas where they need to transit in the north, and we continue to build our awareness of the region, but I would say it still poses some challenges for the operations of submarines submerged under the ice in the Arctic.
On November 24th, 2009. See this statement in context.