The first stage of training, which lasts 21 days, consists of theory instructions and practical military training, where the military and morale levels of a candidate are tested. It is followed by hard military training in the jungle, which includes instruction in jungle warfare as well as demolition and detection and deactivation of landmines, scuba diving, waterborne operations, construction of improvised training, SERE training, basic air mobile techniques, small-unit patrols, react to contact, and ambush training. In addition, cadets are exposed to prisoner of war camp situations and survival courses. During the last stage, they are trained to eat "anything that moves", including snakes and ants, as well as roots, to collect dew drops from leaves, as well as how to execute annihilation attacks, intelligence maneuvers, and penetration into enemy territory. During this stage, candidates must patrol through thorn-filled brush wearing nothing but underwear, roll around in thorns to fortify the body to pain, and spend two days in neck-deep water without sleeping in extreme tropical heat. This stage is called "El Infierno" ("Hell").