In the near future, the climate will warm, the glaciers will melt, and the last land mass will disappear, and the Earth will enter an ocean age. This catastrophic change reduced the population. In order to continue civilization, human beings started the "Merman project". On the one hand, physicists have urgently developed "concentrated oxygen", which allows the human body to move freely in water for a long time after inhaling it regularly. The side effect is that it is unable to rise to the surface to breathe natural air. Biologists, on the other hand, are studying "merman genes". Trying to engineer humans that can breathe in the deep ocean. As an executor of the Merman Project, the player experiences a series of stories as the protagonist participates in the project.

· A fantasy undersea role-playing adventure game
· Guided by the mission, the player can control the protagonist to dive under the sea, search for items, rescue hostages, drive submarines and chase enemies.
· 3D screen, third person, free view.
· Unlike normal games, players no longer move on land, but need to learn how to move underwater.
· Oxygen will be consumed even if you don't move. Players need to learn how to use oxygen properly and how to replenish it.
· Players can also move around freely in the game, watching coral colonies, schools of fish, sharks, underwater relics and other interesting and magnificent pictures.
· There are different bubbles in the deep sea that can supply oxygen, provide acceleration, get into danger, or enter another scene.
· From one scene to another, you need to pass through the undersea channel, which is full of speed and passion, and the player needs to make proper use of bubbles to pass quickly and safely.
· The game also includes a thrilling Boss battle, where the player drives a submarine to fight the Boss.