mountaineer

But the science around using the gas remains disputed and many in the mountaineering industry have criticised it.

British mountaineer Kenton Cool has scaled Mount Everest for the 19th time, breaking his own record for the most climbs up the world's tallest mountain for a non-sherpa.

The north face of the Eiger is famous among mountaineers and it has a reputation as one of the world's most challenging climbs.

He described the cleaning operation as a "challenge" that attracted people with a passion for activities like mountaineering or climbing.

Tryfan is often described as a peak that marks the line between hiking and mountaineering and is difficult to navigate in a traditional manner, especially in poor weather.