Good thing I had that snorkel on... Yup. Gotham is actually ABOVE me... Your guess is as good as mine... So yeah, this is rare, but it's happened before. This one happened as I tried to get into TO Morrow's base... totally random.
Huh. Get this... after posting this, I logged back in, tried to do the seasonal, only to have Ocean Master, all enemies, the turrets and security nodes disappear (I have images of that too... I just haven't uploaded it). What a night rofl
Yeah...rendering issues are surprisingly common. Any chance you're playing on the PS3? One memorable day, I warped into a completely empty Metropolis....no other players, no NPCs...just buildings and parks.