Byron is psyched when his older brother Jesse invites him on a weekend caving trip - even if it means spending time with Cole, Jesse's obnoxious college roommate. Exploring a wild cave is always dangerous, but it becomes deadly as tempers fray and the water level inside the cave starts to rise. When an under-ground confrontation leaves one of the cavers seriously injured, Byron has to make some life-or-death decisions - and every second counts.