"I'll give you another flute when I go out," Li Zimu said lightly as he looked at the sad Qi Ling, whose piccolo was cut off by the sword of a puppet soldier just now.

Gu raisers, most of the weapons are piccolos or flutes, and the original Gu Zhenren's weapon was a flute, because Gu raisers can make specific sounds through this kind of musical instrument, so as to achieve the purpose of controlling insects to fight for them.

In the past, when Li Zimu knew Gu Zhenren, the latter gave him a flute, but he didn't need it anyway, so he could give it to Chi Ling.

"Really!" said with a smile, originally a little sad in her heart, but when she heard Li Zimu say that she was going to give her a flute, the emotions in her heart disappeared at once......

The four of them walked slowly forward, and now they had almost walked a distance of eight hundred meters, and they had not encountered a single mechanism since they had passed the thirty-six Heavenly Gang Puppet Array.

"Do you feel the heat...... Wang Xueling walked in the middle and said suspiciously, I don't know why, she actually felt a little hot, although it was said that the temperature was higher underground than outside, but why didn't she feel it before?

"Mmmm, I feel it too" Li Zimu nodded and said, from six hundred meters to this distance, it seems that the more I walk, the more I feel hotter, I can't help but feel a little strange, could it be that this area has geothermal energy?

Nowadays, geothermal energy has long been known and used, and it is renewable, so it is not surprising that geothermal energy can be distributed anywhere.

"Is there a natural hot spring here?" Li Zimu turned his head to look at Zhang Jingyang and asked, he was not familiar with this place, so he naturally had to ask.

"Yes, there are many natural hot springs in Huludao," Zhang Jingyang nodded and said, this is not a big secret, many people who come here will go to soak in the hot springs once or twice.

"Then it's not strange," Li Zimu said with a smile, where there is geothermal heat, it proves that there is a very likely volcano underneath, and this is located in the Pacific Rim volcanic seismic zone, and it is not unbelievable that there is a volcano underground.

It's just that Li Zimu is strange why this Yingzheng built the Jieshi Underground Palace next to the volcano, but it is also possible that he didn't know that there was a volcano when he built it, and he only discovered it after half of the repair, and there were not so many advanced instruments at that time, so it was impossible to detect the underground situation.

It seems that the spiritual essence of the spirit has fallen, Li Zimu thought to himself, the conditions for the appearance of the spiritual essence are very strict, either a volcano or a glacier, maybe this volcano will have it.

So far they have not seen a single building, just such a straight passage, and they have walked for a day, and now there is not a small half of the distance that has not been completed.

However, just after the four of them walked to a position of almost nine hundred meters, the same straight passage finally changed a little, and several people hurriedly cheered up and walked cautiously towards the place where the flashlight was shining, how many mechanisms there are in this Jieshi Palace, they don't know, and there may be no doubt about this short distance.

"Is that the end of this passage?" said the Spirits, looking ahead, no longer on the ground at their feet, but down a stone staircase.

The stone staircase was long, roughly hundreds of steps, and at the end of the staircase was a flat field, and behind it was a door, similar to the one they had seen when they came in the previous day.

"It shouldn't be, it's only 900 meters away from here, and the Jieshi Palace is more than a thousand meters away from Jiang Nushi, and this should still be within the range of the seabed" Zhang Jingyang shook his head and said, according to the situation on land, below the Jieshi Palace is the Jieshi Underground Palace, and there should be some distance from the Jieshi Underground Palace.

"There are words on it" Li Zimu said lightly, he had already seen the three big characters on the door, this door was not a stone underground palace in the past.

"You can see it from such a distance?" Chi Ling looked at Li Zimu and said in surprise, what kind of eyesight is this person...... It's a few tens of meters away from here, and the door is only the size of a palm from here, and Li Zimu can see that there are words on it, which is too perverted.

Li Zimu didn't say anything, holding the Tai'a sword and taking the lead in stepping on the stone steps and walking down, if there is a mechanism in this section, then the person who designed this is too perverted. The three of them watched Li Zimu walk down, and then they also stepped on the stone steps one after the other and followed.

"It's ...... Prison?" Zhang Jingyang looked at the three big characters on this door and raised his eyebrows and said, this door is indeed the same as the door they came in at the beginning, it is also made of iron mother, it is also two carved dragons, and there is also a sword-shaped groove on the door, but there are three more words on this door.

Hundred Prisons.

Zhang Jingyang wondered in his heart, he didn't expect that there was a prison here, he thought that the Jieshi Underground Palace was just a simple palace, just like the Overlord Palace they entered before.

Li Zimu looked at these three seal characters, but he didn't think so, he had already known that this was a prison, and it was not an ordinary prison, it was all about some famous prisoners. It can't be said that they are prisoners, it should be said that they are all people who are a threat to the Qin Dynasty.

Li Zimu knew about the King of Zhao and the King of Han, they were not executed by Yingzheng as soon as they lost the country, but they died after some years after the unification of the six countries by the Qin State, and for a period of time, they were locked up in the prison of this Jieshi Underground Palace.

Jieshi Prison is the most powerful prison in the Qin State, and it is all locked up by famous and well-known figures in the Six Kingdoms, in order to prevent others from robbing the prison, the defensive force inside is also the largest among the many prisons in the Qin State, as for how big Li Zimu is not clear, because he does not have the authority to know.

Putting the Tai'a sword in his hand into the groove, Li Zimu stepped back some distance. There was another sound of gear turning, and finally it stopped.

With the experience of the last time, Zhang Jingyang also came to help Li Zimu push this time, the weight of this door is really a little terrifying, and I don't know what people thought at that time, and the door has to be so heavy......

"Is this the Hundred Family Prison?" The spirit looked at the scene in front of him and was slightly surprised, there was also a four-meter-wide passage in front of it, but the stone walls next to it had become cells of the same size, each cell was about five meters wide, and the top was about four meters high, and iron rods with such a thick arm were embedded in the stone wall.

The inside of the cell is very simple, a stone platform, a thatched pit, and nothing else.

"Tsk, this wall and the ground are all iron, how afraid you are of not being able to lock people up......" Chi Ling looked at the wall and the ground across the cell and said in amazement, each wall is one meter thick, all of them are cast of iron, and even the ground is watered with molten iron, this level, even if many prisons are not so perverted now.