The hull of the first heavy polar icebreaker for the Coast Guard is taking shape after years of delays on the Gulf Coast. The stern sections of the future USCGC Polar Sentinel (WMSP-21) are now standing almost four stories high in the middle of the Bollinger Mississippi shipyard.<p><p>https://www.marinelink.com/news/construction-two-icebreakers-bollinger-542208</p></p>