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The 21st approaches and the survivors make a plan to get to the extraction point. They must build a raft to travel five kilometers in a river where alligators live.

The survivors cannot get resources to survive in their camps. With the little energy they have left, they undertake walks under a bright sun with the aim of establishing another shelter closer to the extraction point.

Halfway through the challenge, anxiety over hunger and isolation leads some to hit rock bottom. Those who remain face a trial by fire: a terrifying thunderstorm that can destroy their shelters and leave them exposed to the elements.

After several days without eating protein, some survivors already feel desperate. One risks a hunt by exposing oneself to the attack of a alligator. Another, sick and alone, undertakes a journey that may cost her too dearly.

Some participants feel the havoc on their bodies and reach the limit of their strength. Others do not resist the psychological pressure: fears, anguish and conflicts emerge. Giving up seems like the best option.

A mosquito hell causes many survivors to spend the worst night of their lives. The rain threatens to leave them without shelter or fire. Hunger and frustration alter moods and conflicts arise between couples.

The survivors meet their pairs and must walk under a bright sun for several hours. Staying safe from the cold of the night, rain, predators and insects becomes a nightmare. The jungle hits them hard and not everyone resists.