Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
A sinkhole was a hollow area in the ground.
Sinkholes were a feature of Karst topography. (TNG: "Who Watches The Watchers")
Certain spatial phenomena were also described as sinkholes. (VOY: "Gravity", "The Fight")