Four survivalists seek redemption for their past failures. However, their promises to make it through 21 days on a remote Philippine lake are put to the test when they accidentally ingest a toxic substance.

In Mexico, four survivalists attempt to endure 21 days in the ancient Mayan jungle, where humans were once sacrificed to the gods. Battling relentless mosquitoes, torrential storms and stinging wasps, the survivalists must merge into a tribe if they hope to exit the hellscape.