Sunken Temple is a dungeon in WoW Forever. Located underneath the Swamp of Sorrows, this temple is formally known as Semple of Atal'Hakkar. It is a shrine to the blood god, Hakkar The Soulflayer and was built by the Atal'ai trolls to worship them.
This dungeon is designed for levels 50 - 60 and, whilst it can be completed towards the lower end of that range, having a party around level 53 makes the dungeon considerably more manageable.