Antediluvian Secrets is the second map released by the Tamriel Rebuilt team. It covers the area between Telvannis to the north and Sacred East to the south and west.
The first public version (v1.0) was released on November 30, 2008. In this version quests were not implemented. An updated version, which included all miscellaneous quests and some faction quests, was released on June 6, 2012. Some of the important landmarks included are the legendary Dwemer ruin of Kemel-Ze, the Telvanni and Imperial settlement of Helnim, as well as the Telvanni settlements of Marog, Alt Bosara, Tel Muthada, and Tel Mothrivra.