Ocean holes

Ocean holes is listed among the Notable places.

On one open-ocean pixel in forty-eight a black pit opens in the seafloor under a plume of miasma; swimming down leads to a flooded copy of a real dungeon with the deep's own enemies (jet082's mod).

Ocean holes also occur in seas beyond the Iliac Bay. Online, they do not open inside Cyrodiil Map’s PvP area.