The article quotes the BBC:
On these fields, they have come across compacted, dense, ice hard snow call neve.
Neve is the first stage in the formation of glaciers, the team said.”
The team has also encountered sheets of snow weighing hundreds of tonnes and tunnels and fissures known as bergschrunds.
This is how ice ages start–the snow does not melt in the summer, and the growing ice sheet reflects more sunlight back into space instead of absorbing it. As the cycle continues, the earth gets colder. So much for global warming.