History
Having spent years in a mental stupor created by Destiny, the Human Torch was able to break Namor free by immersing him in the Atlantic Ocean. Once there, Namor sought out a nearby Atlantean outpost a few hundred miles off the Grand Banks[2], only to discover it was destroyed. At first he believed it to have been destroyed - apparently by nuclear testing (though he would later discover the cause was actually waste disposal by surface dwellers). This sight made him vow vengeance on the surface world.[1][3][4]
Notes
- In Fantastic Four #4, this site was described as Atlantis but was later retconned to be an outpost.