Why does Everest make an eerie grinding noise?

According to Dave Khan, a member of the expedition on the Trakarding-Trumbau glacier system, at night the ice on Everest starts to collapse here and there. The rumbling and scraping is so loud that it is impossible to sleep.

Using sensors that measure the vibrations of the ice masses, the researchers found that extreme cold, the contrast between daytime and night-time temperatures, and climate change in general are responsible for the night-time rumble. The Everest ice is extremely sensitive to these factors.