I was down Nettle yesterday with a team of 5; in fact to put Frank Browns ashes into the steam at the very bottom. Nowadays I have asthma, which usually is OK while I,m caving climbing etc, but at the bottom of Nettle any physical effort; descending below Beza/Crumble and going down through the crawls, rendered me breathless. By Red River I really was having to concentrate hard just to breathe, so I binned it and came out mindful of the haul out if short on breath and not wanting to delay the others. Of the other 4, 3 complained of breathlessness and took a long time, so perhaps anyone going there should bear in mind the air quality.
Phil Burke