Abyssal Ruins

The Abyssal Ruins are sunken temple ruins in eastern Unova, accessed through the use of Dive outside of battle. It is east of Undella Town in Undella Bay. The ruins are divided into four floors, each smaller than the last. There are no wild Pokémon or Trainers. In Black 2 and White 2, the Abyssal Ruins are not marked on the Town Map until the player has visited them.