So, what do we know about what was going on down there? It's a pretty creepy location, full of all sorts of undead monstrosities and spirits...many of which appear to be sailors. I even saw the wreck of a rusty Garlean airship partially submerged in the ocean nearby.

Did I miss some major revelation or is it intentionally left vague as to what the story behind the place actually is? I assume it could be some sort of experiment/necromancy gone wrong...