chunk: Four years later, Chuck is dramatically thinner, bearded, with longer hair, and wearing a loincloth. He has become adept at spearing fish and making fires. He also has regular conversations and arguments with Wilson, his volleyball friend which has become his only means of socialization. A large section from a portable toilet washes up on the island; Chuck uses it as a sail in the construction of a raft. After spending some time building and stocking the raft and deciding when the weather conditions will be optimal (using an analemma he has created in his cave to monitor the time of year), he launches, using the sail to overcome the powerful surf. After some time on the ocean, a storm nearly tears his raft apart. The following day, Wilson falls from the raft and is cast away into the ocean, leaving Chuck crying and overwhelmed by loneliness. Later, a passing cargo ship finds him, drifting.