The six women who are scaling The Shard building in London are just 18 metres from the top, according to Greenpeace press officer Ben Stewart.
One climber has been nominated to "free climb" the final ascent, meaning she will use no aids such as ropes.
The #iceclimb women are 18m from the top. they've chosen Wiola, 23, from Poland to make an attempt on the summit. She's going for it. Now.
Wiola is the youngest #iceclimb woman. She's free-climbing the final 18m, a third of a kilometre in the sky, right now. Yes, free-climbing.
More top news
Conservationists say one of the UK's most threatened butterflies has recorded its best year for a decade following 2014's warm spring.
The SNP leader Nicola Sturgeon says tonight's TV election debate shows there is a clear demand for a new style of politics across the UK.
A drug addict whose sickening attack on a disabled pensioner caused outrage around the world will be sentenced later.