Altar of Ice: Depths (Japanese: 氷の祭だん最奥部 Altar of Ice: Deepest Part) is a dungeon in Pokémon Super Mystery Dungeon that is located in the Sea of Wonders. It is unlocked after clearing the Sky Ruins and the Altar of Ice. The boss of the dungeon is randomly chosen between Black and White Kyurem, and clearing the dungeon the first time allows for Kyurem to change between its three forms each time the player uses it. After this dungeon is cleared, it can only be revisited through Pelipper Island.
The player will randomly encounter either Black or White Kyurem as the boss of the dungeon.