Dark Deep is an island that appears in many locations in the Franchise, including th TV episode "Quake, Rattle and Roll", as well as several games. Dark Deep is both the ancestral home of the Gronckles in the Barbaric Archipelago and is one of the only known habitats of the Catastrophic Quaken. According to Dragons: Rise of Berk, Tide Gliders also live in the area. The Dragon Riders first discovered Dark Deep with the Dragon Eye, when Fishlegs was experimenting with Meatlug's lava.