The game is based on an 1870 novel by Jules Verne.

On July 5th, 1867 the government decided to launch the famous ship the "Abraham Lincoln", which left on the trail of a sea monster. The great French professor Mr. Arronax took part in the expedition. The weeks passed without any sign of the monster's presence in the area, when, one day, 300 miles from the shores of Queen Charlotte's Island... three members of the expedition set out on board the Nautilus, a submarine navigated by Captain Nemo. The player takes Arronax's role to find out more.

Most of the game is spent on the Nautilus, which consists of three rooms: the living room, the control room, and the library. There the player can manipulate objects and talk to people to receive hints on what to do next and the state of the Nautilus. With the map, he influences the route. Sometimes the player leaves the submarine to explore other locations, and respectively solves puzzles to receive more hints or to solve action sequences, e.g., fighting against a shark.

The game is played in real-time, which means the key to success is being in the right location at the right time. This also results in various possibilities to render the game unwinnable and causes waiting times. For the same reason, the player also needs to watch Nemo's mood. If they anger Nemo, e.g., by manipulating the ship instruments, he locks the player into their room and valuable time passes. The game is played completely in point & click and has no function to save progress.

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