Then he lit the fuses from his lamp and stood a second in assurance that they all were spluttering.
"Now we run!" he announced, and they hurried, side by side, down the drift tunnel until they reached the shaft.

"Far enough," said Harry.
A long moment of waiting.

Then the earth quivered and a muffled, booming roar came from the distance.

Harry stared at his carbide lamp.
"One," he announced.

Then, "Two." Three, four and five followed, all counted seriously, carefully by Harry.