Dark Ocean

The Dark Ocean is a fictional plane of existence from the Digimon franchise. Very little is known about it, except that it seems to be a vast sea of darkness.

Part of the Digital World?
The Dark Ocean is an entirely separate part of the Digital World, and means of accessing are available only to those who have the power to open the portal to it.

Digimon 02
The Dark Ocean appears twice in the anime Digimon 02. The first time is when T.K. and Kari discover its existence in an early episode. The second time is when Ken used the dark power within him to open a portal to the Dark Ocean to entrap Daemon.