Despite their previous success with catching a shark, the search for food continues for the remaining castaways. As hunger and exhaustion sets in, singletons Patrick and Sarah seek comfort in each other while the rest of the men and women start to fall apart - including an explosive row between two of the women. Dan leads an expedition to the other side of the island, but Sarah struggles on the rocky coastline. With a storm coming in and huge waves crashing against the cliffs, they face a race against time to get to safety and avoid being cut off by the incoming tide. Dan must make a difficult decision: do they turn back or risk their lives crossing one last perilous set of rocks?