oth the U.S. and Canada are both building their first polar icebreakers in decades. Polar icebreakers use steel that is considerably thicker than in conventional ships and with tight frame spacings to support icebreaking loads. Last August, Bollinger Mississippi Shipbuilding in Pascagoula, Miss., began to construct the first of eight prototype modules for the first U.S. Coast Guard polar security cutter (PSC), to test the new systems, processes, people, and tools that are required to work with...