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Chasm Cave (Japanese: くうかんのどうくつ Spatial Cave) is a dungeon in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. It has 8 floors and leads to Dark Hill. Since it is located in the future, it cannot be revisited and no Pokémon can be recruited inside of this dungeon.
As the first dungeon in the future, it has many different features. It has no walls, and as a result, the player will be warped elsewhere if they go off the path. Also, enemies can attack the player from the empty space. There are also many new items found here, which will also be found in other future dungeons.