A team of scientists are drilling on the ice shelf and collecting samples of ice to analyze its content. While one of the scientists is drilling, the ice shelf starts to break apart and threatens his life; however, he is rescued by his colleagues. One of the scientists states that the whole shelf is breaking off.
Jack describes the ancient climate shift known as the Younger Dryas. He states that, as the world was coming out of the last glacial period, melting ice sheets added so much freshwater to the Atlantic Ocean that certain ocean circulation patterns shut down. Since thermohaline circulation is a major source of heat for the surfaces of continents, the globe was plunged back into an ice age.