What had just happened was this: We were tied to a floating dock at the Crystal Cove Marina in Winthrop, Massachusetts, which is located just nor’east of Boston. Everything was frozen in thick ice that was under great pressure. Alas, there are nine-foot tides in this area. As a result, our vessel, our dock, and every single thing in the harbor would periodically get temporarily hung up as the tide dropped. Soon, hundreds of thousands of tons of ice would be suspended in the air, first by the barest amount, but eventually by a quarter of an inch or more. To relieve the spiking pressure of all those tons, something had to give. Thus, the ice cracked. Everything fell. It sounded like a muffled cannon shot.