Halo First Strike 23

"What is it, Sergeant?" The Admiral's voice died in his throat. The Master Chief's motion tracker flickered on his heads-up display, but there was no solid contact . . . nor did he see anything across the entire three-kilometer-wide cavern. Had it
picked up a camouflaged Elite? No, the dust in the air would have certainly given it away.-Chpt.20 pg.230