On the morning of April 16, 2014, veteran diver Kang Yoo Sung heard the news of the sinking of the Sewol ferry. He began to gather his equipment after it was revealed to be false that all the victims were rescued. Byung Joo, a diver with 30 years of experience, also headed to the site of the disaster.
With no search system or conditions in place, the divers picked up the victimsone by one, making their way through the tangled chambers of collapsed walls and furniture. But the search grew longer and a fellow diver got killed in an accident.
Soon after returning to land, the divers begin to suffer from pain like anxiety disorder, depression, insomnia, and in severe cases, just quitting their job as a diver.