What can be said about this one XD
What I expected to be a small gathering with a few people turned into a big drain meet with people climbing into the system and meeting us along the way.
While we were all down it rained pretty heavy and we ended up having to seek higher ground until the water levels dropped again, there was some mental abseiling down the plug hole and finally a large explosion that resulted in a mass evacuation.
Oh did I mention I was dressed as Mario
Shortly after the abseiling down the plughole we had to get out sharpish as the drain exploded
Not my pic
And a couple of abseil vids