His cheek was wet, and he could feel fluid pooling. Rafen blinked, scanning the visible glyphs across the line of his field of vision. His helmet had been damaged, along with some of the actuators in his legs, but the cowl of ceramite and steel that surrounded him had taken the brunt of the crash. He took stock of himself, feeling for injuries. Some minor breaks in his bones, contusions and the like, things that would have been deadly to a common human but little more than an irritant to a Space Marine.
......
Rafen took a step and then halted, looking up. Wreaths of smoke and wedges of debris made it hard to see far up the ascent shaft, but he estimated that they must have fallen several kilometres before colliding with the end of the passage.


Hammer and Bolter 16 (Redeemed) pg. 223