Four deep sea saturation divers become stranded 650ft below the surface of the Indian Ocean after disaster strikes their ship. With the air in their bodies compressed to withstand the depth, surfacing too fast without decompressing is unthinkable and will lead to almost certain death. With their diving bell damaged, rescue uncertain and oxygen depleting they are forced to work together to fight for their survival and find a way back to the surface. Hold. Your. Breath.