"Dig!" the rescue captain gave the order.

All of a sudden, all the soldiers took action and moved forward at a constant speed. Every five minutes, there was a burst of counting sounds.

"1."

"2."

"3."

...

"28."

"29."

"30!"

Everyone moved closer to No. 15 and adjusted their positions.

Number 15 is the weather vane for all of them, and it is also the only belief in this vast snowfield.

Numbers were reported over and over ...