The beam of the flashlight and the voice of the fourth squad leader came at the same time:
"Team Leader Shen, over here!"
Shen Ting met up with the officers from Team D, looked at the team leader, and quickly asked:
"Have you found the source of the sound?"
Not at the moment!
But it must be somewhere in this area.
Shen Ting divided the police officers he brought into groups and sent them to investigate.
He was also exploring the surrounding area himself.
"Remove magnets~ Remove magnets~~"
The sound of police boots stepping on coal slag echoed throughout the mine.
"Hmm? This feeling..."
Shen Ting had just turned a corner when he suddenly stopped.
The feel of my feet just now was definitely not right.
It wasn't the hard, granular feel of stepping on coal ash.
The flashlight beam shone on the ground, revealing a damp patch.
In addition, there were ice fragments about the length of a middle finger.
The cross-section of the ice block refracts the cold light of the flashlight.
Shen Ting then shone the flashlight at the top of the mine.
There was a thin layer of ice there.
At the lowest point, there is a remnant of a broken ice cone.
"It's so cold inside the mine!"
I wonder if the seven missing people can hold on.
Shen Ting turned off the light and continued walking into the side path.
However, after walking only ten meters or so, he suddenly stopped again.
He suddenly remembered what the leader of Group D had said when describing the special sound.
The sound was like glass breaking.
And then the icicle fell...
Shen Ting frowned and quickly returned to the corner.
He thought for a moment, then bent down and grabbed the largest piece of ice.
It was bitterly cold, but he seemed oblivious, throwing the ice shards directly onto the rocks on the side of the mine.
*Smack!*
A crisp sound rang out.
The sound traveled rapidly inside the mine.
Finally, a joyful voice rang out:
"Found it, it's this sound, the sound wave frequency is the same."
Come with me, this way.
Soon, a forensic investigator, accompanied by several police officers, ran out excitedly from a side alley.
When they saw Shen Ting standing there, they were first surprised, then excited:
"Team Leader Shen, the sound we detected earlier has just reappeared."
It's nearby, let's look for it together!
Shen Ting felt quite helpless:
"I've found the source of the sound..."
He recounted what had happened, and the surprise on the faces of the forensic investigators and several police officers vanished instantly.
"That was the sound of an ice pick falling and breaking?"
"Oh well, what a waste of my time."
"But that sound really does sound like glass breaking!"
Is it an echo or resonance caused by this mine shaft?
It should be!
I thought we'd found the location of the crime, but it turned out to be a false alarm.
...
Shen Ting wiped the ice water from his hands, his voice neither sad nor happy, and said into the earpiece:
"When the ice cones formed by water seepage from the mine fall and break, they make a sound similar to breaking glass."
Each group should avoid misjudging.
Continue the search within the designated area.
Just over ten minutes after Shen Ting shared the information, the leader of Group A excitedly said into his headset:
"Team Leader Shen, we've made a discovery."
On the innermost part of the area you circled, we found a collapsed rock wall.
The gravel completely blocked the entire passage.
The key point is!
One of the brothers, who grew up on construction sites, said he smelled a pungent odor.
This smell lingers after a detonator explodes.
Wait, there seems to be a sound coming from this side too…
The team leader of Group A suddenly crouched down, his ear almost touching the ground, and after listening carefully for a moment, the surprise on his face became even more obvious:
"Team Leader Shen, there is indeed a sound."
From the other side of the collapsed rock wall.
It wasn't the sound of breaking glass that Group D mentioned before.
It is a distinct sound of stones being struck.
The key point is that the sound is rhythmic.
The interval between taps is three short, three long, and three short.
The armed police on my side said, "This is a standard SOS international distress signal!"
...
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