Up the snow/ice ramp from base there is a show crevasse that the field assistants (=glib term for very experienced mountaineers that look after us down here) kindly take us down every so often. This was my first trip down and despite it being an overcast day it was still spectacular down there. Some photos (some heavily processed):
The melting is increased by the dust and grit kicked off the runway by planes landing.The dark grit absorbs heat and melts several centimetres down through the snow: