This thread is for sharing your experiences with rare Clockwork areas! Here's mine.

So one time I was farming the prestige mission Hazardous Heist on the first level, and it was Clockwork Tunnels Gremlin Grounds and it was always poison themed. So, there was this one room that had a switch in between two solid blocks, guarded by gates. Behind the gates inside of the solid blocks there were one green chests each, so in total there were two green chests. There were two other switches on the bottom of the room that activated the gates. The only way to open the gates was to plant a bomb in between them so it could open both of the gates. When you hit one of the two switches on the bottom, it activated another gate that prevented you from advancing, though it was timed and it quickly opened up, although the gates guarding the chests closed up again. That was the only time I've ever heard of such a room.