Extreme survival series Alive continues with new episodes about human endurance against the odds. In this episode brothers Justin and Jeremy Harris venture into the depths of a Utah canyon. What was meant to be a weekend of brotherly bonding soon turns into a nightmare when a simple mistake leaves one brother badly injured. Soaking, frozen and miles from the canyon's exit, the other has no choice but to find a way out alone in the dark. But, in such perilous terrain, can he even escape, let alone bring help before the sub-zero conditions kill his injured brother?

Sunday 17 February at 4:40pm on Channel 4