With only six days to go, the tribe still doesn't have enough food to see them to the end. After Paul's shock departure and with Mike seriously ill, just four remain in camp. Mike is so malnourished, the medic is concerned he could have liver damage. Mel is working harder than ever and is worried she'll be the next one to crack.
The tribe have less than two weeks to go. The freezing temperatures and lack of success in hunting means everyone is suffering. Mike is showing signs of malnutrition; Mel thinks they have enough rations for the remaining days, topping up with fish from the lake. Paul persists with hunting, but frustration and homesickness kick in.
It's mid-November and the tribe are worried whether Mel's plan to ration the food for the remaining two and a half weeks will work. Paul Barnes isn't convinced: he's been busy setting deer traps. Although unsuccessful, he and Mike are exhausted from hours of hunting. Paul becomes more and more desperate in his pursuit of wild game and more and more exhausted. With Paul on the verge of collapse, an unlikely hero steps up - JP. With no hunting experience, can he tap into his primal instincts and bring back a boar?
Winter is approaching and the tribe needs to ensure they have enough food and wood to survive the next four weeks. Since Steve left, Mel is in charge of rations. Paul has had bronchial pneumonia for three days, but when he returns to the camp he challenges Mel on her plan. With so much work to do, the tribe can't afford to lose another member.
Day 22: after the evacuation due to heavy snow, the remaining seven tribe members continue the experiment. They must preserve and store every last ounce of a deer carcass for the remainder of the five weeks, which causes a disagreement within the group. Leader Steve decides to leave the tribe and Mel steps up but Josie does something inconceivable to JP, making any chance of survival look bleak.
After 10 days living in the Stone Age, 12 members remain and food rations are desperately low. As temperature drops, mum Rachel is struggling. During snow fall, the situation becomes dangerous and there's no choice but to evacuate to modern day, giving everyone a taste of what they're missing.
Day eight: the tribe only have enough rations to get them through another day. Steve uses the last of his dried meat rations to bait a fishing basket, hoping to catch something that will save the group from hunger. But when he finds just two small crayfish, the pressure is on.
Four days ago, twenty modern Britons entered the Stone Age. They have just a few days of rations left and their energy levels are dropping. Two kilometres to the west of their Stone Age camp is a lake teeming with protein-rich fish. Leader Steve Nicholson takes a party on a mission, but with no compass, map or GPS device, it's no easy task.
Three days in 10,000 BC and the tribe's first morning without mentor stone age archaeologist Klint Janulis. It's down to the remaining eighteen strangers to work together if they're to stand any chance of surviving the next eight weeks. Emotions are high and food rations are low; it's up to designated leader Steve to make sure the group survives.
Twenty men and women from every conceivable walk of life in modern society are about to find out the hard way how we've changed as humans since our stone age ancestors. They've agreed to give up everything to live in the wilderness as a stone age community. In the first episode, contestants swap their iPhones and modern clothes for animal skins, basic tools and a pile of flint.
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