June 21, 2015 — It’s got to be one of the worst ways to go: pulled to the surface against your will, changes in pressure attacking your body, only to be tossed away, no relief in site.

Fish inadvertently caught by sport and commercial fishers are known as “bycatch” and billions of them die every year. The ones affected by shifting pressure experience barotrauma and often due senseless deaths, but a new device wants to give them a fighting chance.

Hoping to find innovative solutions to the larger problems of bycatch, the World Wildlife Fund launched the International Smart Gear Competition in partnership with industry leaders, scientists, and fishermen. As sophisticated as the competition sounds, its solutions aren’t being made in a James Bond-esque lab: According to WWF, most are being pioneered by the people closest to the problem—fishermen themselves.

One of the most innovative tools to come out of the competition is the SeaQualizer. Created by two fishing buddies from South Florida, this hydrostatic descending device returns victims of bycatch to their native depths. Unlike fish caught in shallow lakes, many deep-water dwellers won’t survive if you simply toss them back, because as they ascend toward the surface, changes in pressure wreak havoc on their internal organs. By the time you reel them in, they’re experiencing barotrauma and will only pull through with assistance.

Fishermen historically helped bycatch recompress by venting, a process that involves puncturing the fish’s swim bladder to release the gas that built up during ascension. It’s as barbaric as it sounds and often leads to injury or death, but until around four years ago fishermen had no alternative—in some places, venting was even required by law.

Read the full story and watch the Youtube video at Wired