Their location residing near areas of coral reef. They would only
leave the cave to hunt and feed on fish and whales. However, Godzilla's kind are wiped out by a hydrogen bomb testing, leaving an injured and enraged Godzilla as the sole survivor. Forced from his habitat, Godzilla lurked the ocean depths.
A boat of human passengers cross Godzilla's path, to which is destroyed and sunken by the monster's rage. Following the route the destroyed ship had traveled from, Godzilla would sink more ships and boats before arriving to Odo Island and encountering mankind. Godzilla would later march North until attracted by the lights of a major city. Godzilla would then make landfall in Tokyo."
Got this from Gormaru Island