However, the small oil bunker didn't move at all, not even shake it, Lin Yi gave Du Jiu a thumbs up in his heart, and then continued to observe the movement of the oil bunker.

Until the sound of the bell stopped, the little oil tank still didn't move.

Lin Yi looked back at Du Jiu, gave him a thumbs up, and said, "Uncle Du Jiu, you are really amazing, this small oil tank should be more than just a few stones, right?" ”

Du Jiu also gave Lin Yi a thumbs up and said with a smile: "Yiyi, you are really sharp-eyed, you can even see this." ”

You know, Du Jiu didn't tell Lin Yi carefully before.

Lin Yi said: "If it is just a few stones, even if it is glued with good tree glue, the stones will crack and make a sound, but this, there is no sound at all, and there is no shaking and cracking, it can be seen that outside the stone, there must be a layer of sound insulation and shockproof things." ”

Du Jiu listened to Lin Yi with relish, and when Lin Yi finished speaking, he already admired Lin Yi very much, and felt that Lin Yi, a child, could be so powerful at such a young age, which was really rare.

Du Jiu smiled: "Then Yiyi might as well guess, what do I put in the middle?" ”

Lin Yi pointed the index finger of his right hand on his chin, thought for a while, and said, "Sound insulation, and at the same time fire and heat insulation, is it sand?" ”

When Du Jiu heard this, his eyes lit up slightly, and the corners of his lips hooked up a touch, but he didn't speak immediately, but looked at Lin Yi, waiting for her to continue.

Lin Yi thought about it again and said: "However, if it is just sand, the stability will not be very good, so between the sand and the sand, there must be some clay and stones, so that it can not only be soundproofed, but also play the role of fire and heat insulation, killing three birds with one stone, and then put a layer of rock layer on the outside, a three-layer structure, even if the inside is blown up and rotten, it will not affect the outside." ”

After listening to this, Du Jiu slowly applauded, "Pap, Papa, Pap".

"Yiyi, you're right, that's exactly what I used."

Saying that, Du Jiu stepped forward and said, "At this time, it should be almost the same inside." ”

Despite saying this, Du Jiu still used a long rope to tie it to the handle of the door outside the oil tank, and then took a few steps back, until he retreated to Lin Yi's side, and then reached out and pulled the rope in his hand.

Listening to the sound of "bang", the stone door was opened, and in the small stone door, a large cloud of smoke and dust rushed out from inside, and at the same time, a heat wave also gushed out from inside.

Du Jiu hurriedly pulled Lin Yi to the side.

However, when the heat wave reached them, it had already lost its initial temperature, and only turned into a slight warmth.

After a while, the smoke and heat dissipated, Du Jiu and Lin Yi walked forward together, they squatted down, looked inside, and saw that it was covered with fine stones, inside the stone, there was a thin layer of sand, Lin Yi reached out to the edge and touched it, and a large part of the sand on it was firmly stuck to the stone.

After Lin Yi inspected the inside, he took a closer look outside, and there was no greater damage except for slight cracks in some places.

Lin Yi nodded with satisfaction and said, "The oil bunker made by Uncle Du Jiu is so strong, now, I am relieved." ”

Du Jiu looked at Lin Yi, and suddenly a wave of expectation sprouted in his heart, and looking at Lin Yi's gaze, it also became a little strange.