Adam, Jen, Kareem, and Zac are given few supplies and forced to swim to an isolated island in the middle of Lake Huron. They experience difficulty building a fire on the windswept island, worry about when Les might return, and build a lean-to the following day. Adam spots an abandoned canoe on a nearby island, swims to retrieve it, and finds it is too rotten to use. Jen criticizes the building of the shelter. Zac spots a passing ship, but they are unable to catch its attention. The teens catch some crayfish, and Jen criticizes Kareem and Zac's fishing abilities. Morale drops, Adam and Zac build a signal fire, Kareem starts to fall ill, and Jen criticizes how much Kareem is sleeping. The signal fire draws the attention of a boat, which Les is piloting. Les tells the four teens that their next mission is a solo one. No one drops out.