The remaining men are split into two units as the course instructors test the recruits' ability to bond - as well as compete - with each other. In the Sahara desert, the recruits compete in a punishing time trial run across the treacherous Erg Lihoudi sand dunes, before having to work as a team to move equipment across the dunes in a 4x4. During a night-time escape and evasion mission, they must cross a remote river valley in the pitch black of night while avoiding hunter teams who are tracking them with dogs, and one of the teams gets lost. The recruits who fail to show the right character and ability in these tasks are later axed from the course in a shock cull.
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