There is a large metal round table in the conference room, with the prepared information on one side, which seems to be a regular item, and every new member who comes here can get it in time. On the other hand, the weapons and equipment prepared for Cassia, but they are all standard configurations for outpost defense positions and there is no excellence.

The instructions for precautions and information are very brief, because the cavities in the underground world are roughly equivalent to many extreme regions, only one is on the ground and the other is on the ground. The extended issue is the difference between light and air.

Although when cleaning and developing the cavity of the underground world, various fluorescent mosses will often be brought in in the early work, allowing them to reproduce in large quantities, and thus provide light sources. However, compared with the huge cavity, as well as various strange terrain and caves, the light sources of fluorescent mosses can only illuminate a very small area. Therefore, most of the cavity of the underground world is still in the dark.

Light is a matter of concern, especially the current stage of pollution, and the underground world around the southern forest. The person in charge emphasized that other accompanying personnel also agreed. They are all captains of the cleaning team, staying here for the longest time and having the richest experience.

"Bioinductive field is a common method to create light sources, no doubt about it. However, in this area, due to pollution and proximity to southern forests, the inductive field itself will be affected to varying degrees, and maintaining it will be more troublesome."

"In addition, when you really go to the cavity, you will immediately feel its hugeness. So many times, the light from the inductive field light source cannot be transmitted far away, and it only illuminates a place. Please remember that in the cavity, the senses in vision are only auxiliary, please use mental perception more." They couldn't help but solemnly reminded, which shows that they have indeed paid a considerable price in this regard.

Then they talked about the air problem.

There is no air circulation in the underground cavity. Although people who come here do not need to breathe, it does not mean that the substances contained in the air will not actively come to them. Fungal spores, bacteria that get mixed in, toxic smoke, tiny substances that erode various things, etc. When vision is disturbed, it is tantamount to a difficult thing to capture them by relying on mental perception.

The lack of air circulation leads to the emergence of many troublesome environments, which is bad news; but precisely because of the lack of circulation, in another aspect, it is good news - the problematic air has a rough range, and the possibility of spreading to other areas is not high.

When the initial detection work is done well, similar problems can be avoided. This type of work is the home court of Miss Hillary Lily and others, and surgeons who perceive the evolutionary route can complete this type of work very well.

As he said that, a map was in Cassia's hands. Although it was simple, it was completely enough for them. Various dangers were identified on the map, not only the substances present in the air, but also the soil, terrain, etc., and the danger levels were divided.

In addition, there are descriptions of which area, the number and strength level of underground creatures appear in which area. Finally, Cassia saw a bold dotted line connecting with the underground world under the unfinished southern forest at the edge of the map.

"The cracks caused by abnormal movement of tree rhizomes in ancient history?" he asked.

"A large number of people gathered here, and this crack is the main reason. The underground creatures in this cavity don't need so many surgeons to gather. Even in the early stage of the cleaning work, Lord Krys and others came to help themselves, killing the powerful underground creatures in it, and destroying some of the extremely dangerous species." The person in charge explained.

"Most powerful underground creatures come into this cavity from that crack. Although the harsh situation has been controlled, the crack is still expanding, which is not a dispute. At present, it is precisely because the underground creatures that have come through within a unit of time are limited, so this underground world still has value in utilization. If it reaches a certain point in time,,,"

The words did not continue, Cassia nodded and said she knew, thank you for the explanation. He knew some related matters, such as Lisuman had cleared powerful underground creatures and blocked the cracks. Of course, it was impossible to block them all the time, it was just delaying the expansion of the cracks.

After all, as the boundary of the underground world, it is not the rock formation or the thick earth, but the cage-like structure formed by the tree root system network of the ancient historical world. The abnormal movement of the rhizome network has caused gaps in these cage-like structures.

The person in charge and several other team leaders continued to introduce various information, and more information went to Cassia - the detection completed regional topographic map, the location of the supply point, the introduction of various underground creatures, offensive methods and weaknesses, a safer and comfortable route, etc.

By the time the general explanation was completed, it was more than ten minutes later.

Cassia recorded all the information in his mind, and most of the members of the hollow space of the underground world basically returned, and the open area that Chrys promised was almost empty.

Symbolically took the weapons and equipment prepared on the table. In a burst of cheers and applause, Cassia bathed in the light of various fluorescent mosses and went to the inside of the cavity. Two people followed and understood that this was the protective member arranged by Chrys, and he expressed his gratitude.

Behind him, the calls from other members were heard at the same time—

"Stay in there as much as possible, and hopefully we will meet again in at least three days!"

"At that time, we will warmly welcome your return!"

"Let's play with it more often. Although it can't be said to be cleaned up, in recent times, only when you get close to the cracks will there be difficult underground creatures."

"Yes, there is nothing to do, it's good to lie down and sleep!"

The last sentence was the most popular, and the members around him echoed, welcoming Cassia's arrival and departure, and also celebrating the rare holiday that finally came. Only the two behind Cassia were a little helpless. However, there was no sadness or regret on their faces. When the protection task was completed, the holiday would be waiting for them.

As the cry was heard, the three of them walked through the tunnel-like entrance and exit for hundreds of meters. The already open field of vision suddenly expanded, and the deep darkness almost poured into their pupils.

The light of the fluorescent moss became insignificant, and Cassia felt that what she saw at this moment was an endless starry sky, with sporadic stars dotted it, and there was nothing else.

"Mr. Cassia." Next to him, Koleux, one of the protection members, opened his mouth and pointed in a direction. "Slova and I both recommend this direction. The terrain is flat and the pollution concentration is relatively low. While there are underground organisms, the intensity and quantity should meet your requirements."

"Thank you." Cassia said politely.
Chapter completed!