"We dive so humanity survives." That is the motto of the Hell Divers, who risk their lives to keep the final remnants of humanity alive. All remaining humans now live aboard massive airships that float above a storm covered, radioactive Earth, which has not been habitable for the last 250 years. These dated airships have only managed to stay in the air by regularly sending Hell Divers down to the planet below to scavenge the parts they need to keep their reactors running. Hell Divers, who have an average life expectancy of only 15 jumps, are composed of brave men and women willing to risk their lives by parachuting down through the storms to a toxic planet where they scavenge for items created in the past by a people they no longer understand.