I'm trying to remember an episode from the 1960's Batman TV show that I saw when I was a kid. I'm not quite sure who the villain was in the episode but I'm pretty sure it had Batman and Robin. The episode was about Batman, Robin, or both being stuck in a room made out of concrete (almost like a dungeon) and I believe they were stuck on some sort of platform that was getting smaller and smaller. There was some thing underneath the platform in water that would've killed Batman and/or Robin if they fell in (which of course, they didn't). Does anyone happen to know what episode this is?