Ever 17: The Out of Infinity

The game begins on 1st of May 2017, when all of a sudden a blackout occurs in an underwater marine themepark called LeMU, its communications system went down, the park springs a leak - some of it got flooded, which ended up blocking the exits and had the characters trapped inside. The themepark might collapse after 119 hours because of the water pressure - which also gives the characters a hard time swimming and breathing at the same time as it would kill their lungs.