The Search Party.

He was still focusing intently on the mountain walls when the mountain itself began to shake. A massive vibration went through the mountain. He stumbled as the ground cracked open. A massive gorge appeared in the cavern. It split the cavern apart quickly. He levitated in the air so as not to fall into the chasm that opened on the floor. 

The crack that split the cavern didn't originate from the cavern. The crack came from the mountain walls. The entire mountain is being split apart. It is shaking and large icy rocks are coming loose from it. 

"This can't be good."

He was right. There was a loud roar as the mountain began to separate. The cracks turned into large rifts that continued to widen. The ground was shaking from all the vibrations and explosions caused when the large rocks hit the ground.