The Doomesday Glacier is melting -Thwaites in Antarctica

https://www.theguardian.com/world/2021/dec/18/scientists-watch-giant-doomsday-glacier-in-antarctica-with-concern

Domesday Glacier Thwaites is melting with enough ice melt to raise sea level half a metre on its own, It is the size of the UK

and acts like a funnel to let other glaciers start melting behind it.