An MMA fighter, two Recon Marines and a Navy SEAL Team 6 veteran face off in a fiery shooting challenge and a breach course. The final two risk drowning and hypothermia in a test of their intelligence in ice-cold water.

Four highly trained operatives from diverse military and security fields show off expert marksmanship and stretch their mental brainpower to be the first to escape from a jail cell.

The competitors must escape from the claustrophobic confines of a water coffin, dig their way through a mined obstacle course and break the codes on a series of safes while suspended upside down.

Amid explosions, fireballs, mud and smoke, the four competitors must race on their backs through a complex maze to freedom and endure a brutal test of strength in a gladiator-style tug of war.

The four competitors must dig deep under and over a series of walls carrying an 80-pound load and snake their way through a complex web of lasers. The final two operatives must keep their heads to diffuse a hurt locker of bombs.

Four skilled warriors have to carry ammunition cans uphill and then hit targets at 60 feet. They have to break out of a frozen ice truck, and the two finalists must open safes and shoot themselves free while hanging upside down.

The operatives must tunnel under and then over a series of fences while navigating explosions. The two finalists must use their wits to deactivate a series of bombs.

The operatives square off in a demanding, four-way game of tug of war. Then they must saw through metal to escape an underwater coffin, and the two finalists face a memory challenge with life and death stakes.

In the season finale, the operatives square off in an explosion-filled maze and grueling five-obstacle breach course. The two left standing must use strategy and their wits in an intelligence challenge with life and death stakes.