One of the coolest things on earth! And yes, I know it isn't exactly clean to play in, but it was too fun an opportunity to pass up. Like a child playing in mud!
Also, super hard to catch in a video format. Settings f1.4, 1/25th and ISO 16000! So you'll forgive the graininess I hope!
Sound used is shared under creative commons:
So is this really neat music: