"They can't get us _here_, at any rate, no matter what happens! This place is like a fort, and--" His speech was interrupted by a dazing, deafening tumult of sound.

The earth trembled, and the laboratory, steel though it was, with concrete facing, rocked on its foundation.

A glare through the windows, quickly fading, told them the building they had just quitted was now but a smoking pile of ruin.
Flint gasped, unable to speak.

Waldron, shaking and cowed, tried to moisten his dry lips with a thick tongue.
"We--we weren't any too soon!" he gulped, without one thought of the doomed scabs in the Administration Building.

Stern justice was now overtaking these wretches.