Bears drops the 16 castaways in caiman-infested mangroves and deep water. The two teams soon meet, and it quickly becomes clear that the island isn't their biggest challenge.

After a class war on the Pacific desert island, the wealthy and less well-off teams go their separate ways and set up two camps at opposite ends of the same beach.

In search of much-needed food, Barnes decides to risk strong currents and rip-tides on a journey by raft to a nearby island, but the voyage has disastrous consequences.

The castaways are malnourished after three weeks on the island; the wealthy and less well-off teams finally put their differences aside in a joint hunting expedition.

The two camps decide to settle their class issues and battle the high seas, in a joint bid to raft to the neighbouring island.

Bear Grylls arrives on the island eager to get the stories behind the castaways' class war and their often dubious survival strategies.