No No No, not a cave, a well.
The 12th Imam crawled down a well to hide to avoid capture.
This 12th Imam crap started sometime in the 12-14th century.
He lived in a cave in the mountains, that's probably the part of the story you are refering to. It's a special lunatic fringe sec of Shia Islamism that believes that tale. (mind you, all Islamic "scripture" and writings are handed down by lunatics)
How can this guy be so great if he is chicken enough to have to hide in a well for 600 or so years??
Okay...let me get this straight. Their savior moves from one hole in the ground to a different kind of hole in the ground and then hangs out for 600 years?
(mind you, all Islamic "scripture" and writings are handed down by lunatics)
Worshipping some chicken-sh!t cave/well dweller is proof positive of that.