Morning of the 21st.

It finally dawned.

Lin Feng took out the map.

On the map, it's just a small circle, which doesn't look like a big place.

But in fact, it is a place with a radius of more than ten miles.

The old method is to bury explosives on the ground and listen for a sound.

Whenever there is a cavity under the ground, different sounds will be produced.

Sound waves travel slower in air,

The sound generated by the explosion propagates in the mountain, and when it encounters the underground space, it will produce an echo.

In fact, it is part of the reason for the sound wave lag.

At the same time, the stone walls in the cave will also reflect sound waves.

Because the time is so short, ordinary people's ears cannot distinguish it.

Even the most advanced sound wave detection equipment is difficult to detect.

Otherwise, these buried gold would have been discovered long ago.

Gradually, the golden days became a legend.

Lin Feng's ears are sharper than those of a dog once he concentrates.

The capabilities of living things are beyond the reach of human technology at this stage.

Not to mention Lin Feng, he can't even compete with dogs.

Lin Feng flew a drone, took pictures of the surrounding maps, and printed them into a drawing.

Lin Feng then observed it for a while and marked it on the picture.

"Here, here, and here..."

"Well, well, well..." Liu Erwa nodded repeatedly.

The place Lin Feng marked with a pen was the place where the blast occurred.

After the explanation, Liu Erwa and Zhao Xiaoyang set off with their backpacks on their backs.

Of course, Lin Feng was not idle, searching nearby for possible traces of his childhood decades ago.

It has been too long, it has been seventy years, and the power of nature has long covered the traces of human beings.

Tang Mi held a metal detector and found a few rusty stainless steel pieces.

Unfortunately, this does not determine the exact location of the treasure cave.

There were many talented people in the small days a few decades ago. The location of each fortification was carefully explored and built to be extremely hidden.

The topography of this place is special. It is actually a huge island with not enough depth.

Once exposed, it can easily be bombed by the Americans with aircraft and naval guns.

After searching for a long time, Liu Erwa had already found it, but Lin Feng couldn't find it either.

Secretary Tang pouted and threw away the metal detector and some sonar equipment specially used for treasure hunting.

It is still the most advanced thing, but I have been looking for it for most of the day and still can't find it.

Ouyang Moli said with a smile: "If the treasure of my childhood could be found easily with these instruments, it would have been dug up long ago."

Tang Mi said: "Then you can only listen with your ears. My ears are very good."

Ouyang Moli glanced at Qi Yao, who was silent, and whispered in Tang Mi's ear: "Was it fun last night?"

Tang Mi smiled slightly and raised his head slightly.

She didn't answer, but her expression was a little awkward.

This is also an answer.

Ouyang Jasmine pouted, thinking that I am also afraid of the dark, otherwise... hum!

At this moment.

"Wow!"

Tang Mi suddenly let out a scream.

It turned out that there was a spider half the size of a palm lying on the ground next to her. It looked like it was poisonous, and she was startled.

Ouyang Moli was stunned when she saw it.

What a scary big spider!

Qi Yao frowned slightly, took a few steps forward, and crushed the spider flat with a click.

Then he walked away without looking back, getting further and further away.

Except for cockroaches, Qi Yao is not afraid of anything else.

After dozens of seconds, the two women came back to their senses.

"Too cruel!"

Ouyang Moli sighed.

Of course she was talking about Qi Yao, because she was more afraid of Qi Yao than Tang Mi.

I think back on the island, someone pretended to be a fisherman and wanted to sneak onto the island. After he died, Ouyang Moli saw Qi Yao holding a scalpel...

"Yeah! Like a robot without fear."

Tang Mi's soft voice made Ouyang Moli wake up from the 'horrible' memories.

Ouyang Moli nodded, "We can't annoy her from now on, otherwise..."

Ouyang Moli made a belly-drawing motion.

We are all women, why are there such big differences?

Ten meters ahead, Lin Feng was one step behind, walking side by side with Qi Yao.

He leaned close to Qi Yao's ear and asked in a low voice: "Yao Yao, did you do this on purpose?"

"Um?"

Qi Yao looked at Lin Feng and made a little confused sound.

"Pretend to be cool!" Lin Feng whispered.

"Why should I act cool?" Qi Yao asked softly.

Lin Feng nodded, "You are already cool, you don't need to pretend, they will be very afraid of you."

To put it bluntly, Qi Yao never thought about pretending to be cool in front of them.

Because of disdain!

Lin Feng wondered when Qi Yao's title of "Boss" became popular.

It seems like it started from Liu Zangyun, right?

To be the boss, of course, not only must you look beautiful and be favored, but you must also be convincing.

Qi Yao was born with a temperament that impressed them.

…

Ten minutes later, Lin Feng stopped and saw a stone wall in front of him.

"That's it!"

Lin Feng said something, then put down his backpack, picked up the walkie-talkie, turned it on, and immediately notified Liu Erwa and Zhao Xiaoyang.

By this time, Liu Erwa and Zhao Xiaoyang were far away from the blast point and were squatting under a tree to wait.

After getting the replies from the two people, Lin Feng took out the remote control for detonation, which had a row of buttons marked with numbers.

The twelve buttons in front represent twelve blasting points.

After turning on the remote control, Lin Feng put his ear against the stone wall.

Tang Mi was curious, and she also learned from Lin Feng. She was very curious to see if she could identify the location by listening to the voice.

"Boom~"

When Lin Feng pressed a button on the remote control,

To the northeast, there was a muffled thunderous explosion more than a thousand meters away.

Lin Feng closed his eyes and focused all his attention on his hearing.

After dozens of seconds, Lin Feng frowned.

Then, he pressed the button again, and there was another explosion in the southeast direction.
To be continued...