The ruins of an Un-named Atlantean city were found through a sea fissure, deep in the Earth's core.
The actual coordinates of these Atlantean ruins in the center of the earth is unknown. The fissure that led there was located 721 miles northeast of Honolulu, but the Atlantean ruins were located much farther...deep beneath the earth's crust. And possibly no where near those coordinates. Wonder Woman suspected that it must have fallen through a sea fissure and ended up there.
new SuperFriends (1978):