Although the Bat Cave took a while to come into play on Gotham , its origins are completely dissimilar to that of the comics and movies. The canon for the Bat Cave's origins is that it was a tunnel underneath Wayne Manor that was used during the Civil War. More accurately, it was used as a shelter and a location to transport those who needed to come to the North for safety. In short, it had a positive history. But Gotham totally spins this around. In the show, the Bat Cave was Thomas Wayne 's pr...