Lin Mo makes a living by salvaging relics from the seabed. In the last five minutes before running out of oxygen, he climbed into the wreckage of a Japanese transport ship from World War II. The warehouse was filled with numbered wooden boxes, but a strange prompt sounded in my mind: [The sunken ship blind box system is activated. It consumes 5 minutes of oxygen each time it is opened, and the items in the box can be obtained randomly. Yes/No on? Facing the countdown to death and unknown rewards, he must use his last gas cylinder to gamble on a chance to surface alive.