Following mountain training, the jungle phase takes place in Belize, Brunei, or Malaysia. Candidates are taught navigation, patrol formation and movement, and jungle survival skills. They then return to the UK to begin training in battle plans and foreign weapons, and then take part in combat survival exercises, ending in week-long escape and evasion training. Candidates are formed into patrols and, with nothing more than a tin can filled with survival equipment, are dressed in World War II-era uniforms and told to head for a particular destination by sunrise. The final selection test, resistance to interrogation (RTI), is arguably the most gruelling and lasts for 36 hours.