In reply to Dave Garnett:
> (In reply to jimjimjim)
> [...]
>
> Yes. I once did Gaping Ghyll main shaft on a figure of 8 just like I would climbing. What with the water and the polypropylene and the single rope and the effect of less weight on the rope as you descend... I learned quite a lot about abseiling I hadn't really thought about before.
Got me thinking here. In 1999 I was lucky enough to get to the bottom of the Gouffre Berger in France. The last pitch 1000m underground is the aptly named Hurricane pitch.
You traverse out on a ledge about 10m to a place called the Eagles Nest with a massive waterfall on your right. Then there's a 180ft free hanging drop which puts you about 10-12m away from the bottom of this giant waterfall.
I did it back in the days of carbide light so as soon as it blew out in the gusting wind from the waterfall you were in pitch blackness with deafening sound.
On the way back out you fight your way through the spray to grab the rope, attach your ascenders and in my case, don't stop jumarring until you get to the belay. You know you're there when your helmet bangs into the rock at the top.
Spooky as hell but an amazing place to be.
E