Halo Flood 1

The Master Chief nodded and was about to move for the door when an explosion echoed through the cryo bay. The first blasts slammed into the observation theater's door with a noise that made Sam jump. His heart pounded as he quickly hit the door controls, engaging an emergency lockout. A heavy metal barrier slammed into place with a crash-then began to glow red as bovenant energy weapons burned their way through.

"They're trying to get through the door!" he yelled. He glanced down into the bay and saw Thom, a stricken look on his face. Sam could see his own startled reflection in the Spartan's mirrored visor. Sam lunged for the alarm, and had time to call in an alert. Then, the security door exploded in a shower of fire and molten steel.-Chpt.1 pg.23