The Submarine Boys' Lightning Cruise - Victor G Durham - Bog

"Danger!" That sign might have been over an air-hole in the ice; or it might have been near rapidly moving shafting and belting in a factory. As a matter of fact, the letters, white against the red paint on the door of the shed, meant danger in the most terrible form. It was the sort of danger, which, defied too far, would send one traveling skyward.