Following on from their first winter ascent of Gasherbrum II in 2011, Simone Moro and Denis Urubko are currently on expedition attempting the first winter ascent of Nanga Parbat (8125m).

The pair have been releasing regular video updates of their expedition, and we have the fourth video here, as well as a selection of stunning images from the trip so far.

Their most recent blog on the North Face Journal states:

"One year ago Denis, Cory and Simone reached the summit of Gasherbum II... making history; by achieving the first ever winter accent on the Gasherbrum II.

Today is a special day for the boys at base camp, on one hand, they await a good weather window to attempt the first winter accent of Nanga Parbat and on the other hand they celebrate their success on GII."

• You can follow the expedition on The North Face Journal

VIDEO: Dispatch 4 from Nanga Parbat

PHOTO GALLERY: Nanga Parbat in winter - 2012