How deep is the cave

At the time we were there, we went down to the sixth level, which was about 100 feet down

Thank you for your interest in Seneca Caverns. The cave was surveyed to 165 feet below the surface. Due to the presence of the underground river in the lower levels of the cave, the total depth of the cave is unknown.

It goes down several hundred feet. Depending on how high the ground water is, determines how deep you can go for the tours

Deeeeep!