Seeing this, the wolf cub immediately rushed to the other side of the bulge, pulled out a spindle-like object with a tail from the armpit of the armor, and chised it hard on the stone skin, and then punched it hard.

This kind of thing that looks like a spindle is called a monitor. Its actual function is similar to a stethoscope, which can be used to listen to sounds underground, or to smash on enemy warships to listen to sounds in warships.

Of course the latter is very dangerous. Since this thing was invented, no commando has been so stupid as to do this.

Ye Fei's sound wave emitting device emits regular ultrasound waves, which spread out layer by layer within the bulb. Due to the different acoustic resistances of continuous and discontinuous dielectrics, some sound waves appear partially reflected when the medium changes. When these reflected ultrasound waves are received by two people, the general structure inside the bulb can be drawn.

The detection found that there was a huge space under the bulb, but the thinnest part of the stone outside the bulb was more than five meters thick.

"No wonder!" The wolf cub suddenly realized, "Even if you use **, you have to add a point to blow it up, let alone I just smash it a few times... is the spaceship below, right?"

"It should be, the space below is quite regular," said Ye Fei.

"What should I do now? Blow it open?" the wolf cub asked, pointing to the bulge.

"No, look for it first." Ye Fei refused, "If the three mountain people who escaped from the stone house were not blocked by drones, they would have run here. There must be an 80% passage to enter the spacecraft here, and the thing in the stone house was probably taken out of the spacecraft."

"It makes sense!" The wolf cub nodded, "But where can I find the entrance to such a large spacecraft?"

The known part of this spacecraft is more than four kilometers long and has a width of no less than one kilometer. It is really not easy to find a passage with a diameter of less than one meter within a range of four square kilometers.

"What else can I do? Listen slowly." Ye Fei raised his finger and rushed into the depths of the cave to compete.

The wolf cub sighed: "I accept my fate!" After that, he continued to go deeper with a dejected look of more than 100 meters, and smashed the monitor into the rocks under his feet.

Ye Fei remained motionless and activated the sound wave detection device again. Soon, the underground structure within a distance of 100 meters was roughly outlined, and it was basically all rock formations.

The wolf cub couldn't help but shout, "Such a thick rock layer. Could it be that it is layer by layer?"

"It's possible." Ye Fei said. "This place should be similar to the cave on Earth. It's the result of groundwater seepage. As long as the spacecraft stays here for a long time, it's not surprising that a layer of limestone is deposited on the spacecraft."

He rarely said such knowledgeable words. Unfortunately, the wolf cub just agreed and disappeared. Instead, Commander Ye, who was rarely shown, felt relieved.

The two of them detected the situation underground one after another. Soon they found several small caves that directly lead to the underground spacecraft. The largest one and the only cave that allows combat armor to pass through is submerged under a small pool with a diameter of only one meter.

The two discussed a few words and made the decision to dive into the pool to take a look. The wolf cub drew out his saber and jumped into the pool without hesitation. He rushed to the ground and sank. When he encountered a bumpy place, he used the saber to repair it a few times.

There were only two people in the cave, and he dared to let Ye Fei jump down first, and after returning to the warship, he had to join forces and beat him up. The wolf cub couldn't take the initiative.

The wolf cubs that dived into the pool water soon flew out.

"How is it?" Ye Fei asked with some expectations.

"Not very good." The wolf cub smiled bitterly: "There is nothing below, this is a very deep pool."

"Damn it, I thought this was an entrance." Ye Fei couldn't help but curse, "Try something else."

"That's a problem, the remaining diameter is too small." The wolf cub said scratching his head.

Ye Fei was full of confidence: "What's the problem? Just throw the grenade and explode it?"

The scissors hesitated: "Is this suitable?"

"What's wrong with it?" Ye Fei asked, "What are you worried about? This spacecraft has been stopped here for thousands of years. No matter how powerful the spacecraft is, it will be over. Even if there is a situation, it's amazing that we both escape immediately and finish it, hurry up."

"You are the head, listen to you." The wolf cub walked towards another hole like a shaft with water droplets all over his body, took off his grenade and threw it in.

With a bang, bright flames and gravels rushed into the hole, and the dust on the top of the cave rustled down, and the echoes of the explosion stormed back and forth in the cave, and it took a while before gradually dissipating.

Before the explosion of smoke and dust disappeared, Ye Fei approached the cave and fired a beam of ultrasonic wave into the cave.

"Boss, how about it?" the wolf cub asked expectantly.

"It's still a little bit, throw another one." Ye Fei moved away from above the cave.

The wolf cub agreed and threw another grenade in.

The diameter of the hole was enough, but the broken rocks also laid a thick layer under the hole.

The wolf cub was too lazy to jump down to clean it up, so he simply buried a grenade in the gravel layer and exploded it again.

The explosion collapsed most of the pieces out of the hole, but the pieces collapsed on the hole wall actually made the gravel layer thicker.

The wolf cub and Ye Fei could only lower their heads and drill into the hole to clear out the remaining gravel.

Now I finally found a real entrance, but the two of them were stunned again.

Although the hatch door is also circular, there is no structure on the door that can be used to open the hatch door. There are only text symbols that don’t know what it means. They are surrounded by two concentric circles, one and one small, around the circle of the hatch door. They do not look like the hatch door, but rather like some mysterious work of art of unknown origin.

"Damn it, can you tell me the riddle first when you enter the door and open a treasure? Why don't you just put a sphinx?" The wolf cub couldn't help but swear.

"All right, it's useless. Don't do it and explode it!" said Ye Fei, a destructive maniac.

"This is not good, right?" Langzi smiled, "If I go and capture those mountain tribes, they must know how to get in."

"Okay." Ye Fei nodded, "I'm waiting for you here, go and go back quickly."

He estimated that this spacecraft buried in the rock formation was the reason why the civilization inheritance of the mountain tribe has never been cut off. It would be better not to destroy it.
Chapter completed!