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This infobox is incomplete. Please feel free to edit this infobox to add missing information and complete it. Reason: Iron and Iceberg Chambers images
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The Underground Ruins (Japanese: 地底遺跡 Underground Ruins) is an area located within the Clay Tunnel.
Rock Peak Chamber
The legendary golems, Regirock, Regice, and Registeel, can all be found here. Which of the golems encountered depends on various conditions. Regirock can be found in the Rock Peak Chamber (Japanese: いわやまのま Rock Mountain Room) once a puzzle is solved. Registeel requires the Iron Key to unlock the Iron Chamber (Japanese: くろがねのま Iron Room), while Regice requires the Iceberg Key to unlock the Iceberg Chamber (Japanese: ひゅざんのま Iceberg Room). The Iron Key can only be found in Black 2 and the Iceberg Key can only be found in White 2; the key that cannot be found in one version can be sent through Unova Link from another game.
If all three legendary golems caught here are present in the player's party, Regigigas can be awakened in Twist Mountain.