Steel steam and flame

There is a large metal round table in the conference room. On one side are prepared materials, which seem to be common items. Every new member who comes here can get them in time. On the other side are weapons and equipment prepared for Cassia, but they are all standard configurations for outpost defense positions, and there is nothing special about them.

The instructions for precautions and intelligence are very brief, because the situation of the underground world cavity is roughly equivalent to many extreme areas, except that one is on the ground and the other is underground. The problem derived from this is the difference between light and air.

Although in the underground world cavity, when cleaning and developing, in the early stage of work, various fluorescent mosses are often brought in to allow them to multiply in large numbers and provide light sources. But compared with the huge cavity, various strange terrains and caves, the light source of fluorescent mosses can often only illuminate a small area. Therefore, most of the underground world cavity is still in darkness.

Light is a problem that needs attention, especially at the current stage of pollution, and in the underground world around the southern forest. The person in charge emphasized, and the other accompanying personnel also agreed. They are all captains of the cleaning team, who have stayed here the longest and have the most experience.

"Using bioelectric induction field to create light source is a common method, nothing else. But in this area, due to pollution and proximity to the southern forest, the induction field itself will be affected to varying degrees, and it will be more difficult to maintain."

"In addition, when you really go to the cavity, you will immediately feel its hugeness. So many times, the light of the induction field light source cannot be transmitted very far, and it only illuminates a place. Please remember that in the cavity, the visual sense is only auxiliary, please use spiritual perception more." They couldn't help but remind solemnly, which shows that they have indeed paid a considerable price in this regard.

Then they talked about the problem of air.

There is no air circulation in the underground cavity. Although people who come here don't need to breathe, it doesn't mean that the substances contained in the air will not actively find them. Fungal spores, mixed bacteria, toxic smoke, tiny substances that will corrode various things, etc., when vision is disturbed, it is difficult to rely on spiritual perception to capture them.

The lack of air circulation leads to the emergence of many troublesome environments, which is bad news; but because of the lack of air circulation, it is good news on the other hand-the problematic air has a general 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 kind of work is the home field of Miss Hillary and others. Operators who perceive the evolutionary route can complete this kind of work very well.

As he said, a map went to Cassia's hand. Although it was brief, it was completely sufficient for them. Various dangers were marked on the map, not only the substances in the air, but also the soil and terrain, etc., were divided into danger levels.

In addition, which area had what type of underground creatures, and the number and strength level were all explained. Finally, Cassia saw a bold dotted line connecting to the underground world under the unfinished southern forest at the edge of the map.

"The crack caused by the abnormal movement of the root network of the ancient historical world tree?" he asked.

"A large number of people gathered here, and this crack was the main reason. There is no need for so many operators to gather for the underground creatures in this cavity alone. Even in the early stage of the cleanup work, Lord Clays and others came to help in person, killing the powerful underground creatures and eliminating some of the most dangerous species." The person in charge explained.

"Most of the powerful underground creatures came to this cavity from that crack. Although the bad situation has been controlled, it is an indisputable fact that the crack is still expanding. At present, it is precisely because the number of underground creatures running over per unit time is limited that this underground world is still worth using. If it reaches a certain time point..."

The words did not continue, Cassia nodded to indicate that he understood, thank you for the explanation. He knew some related matters, such as Lisuman had cleaned up powerful underground creatures and blocked the cracks. Of course, it is impossible to block them all the time, but just slow down the speed of crack expansion.

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

The person in charge and several other team leaders continued to introduce various intelligence, and more and more information went to Cassia's hands-the topographic map of the area completed by the detection, the location of the supply point, the introduction of various underground creatures, the attack methods and weaknesses, the safer and more comfortable forward routes, etc.

It was more than ten minutes later when the general explanation was completed.

Cassia memorized all the information, and most of the members in the underground world cavity had basically returned. The open area promised by Kles was almost vacant.

Symbolically taking the weapons and equipment prepared on the table, Cassia went into the cavity in the light of various fluorescent mosses amid cheers and applause. Two people followed him, and he knew that they were the protection members arranged by Kles, and he expressed his gratitude.

Behind him, the voices of other members sounded at the same time-

"Stay in there as long as you want, I hope we will meet again in at least three days!"

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

"Play more in there. Although we can't say it's cleaned up, there are only difficult underground creatures near the crack area recently."

"Yes, there's nothing to do, just lying down and sleeping is good!"

The last sentence was the loudest, and the surrounding members echoed, welcoming Cassia's arrival and departure, and celebrating the rare holiday. Only the two people behind Cassia were a little helpless. However, there was no sadness or regret on their faces. When they completed the protection mission, the holiday was waiting for them.

Amid the shouts, the three people passed through the tunnel-like entrance and exit, and walked forward hundreds of meters. The already wide field of vision suddenly expanded to the limit, and the deep darkness almost poured into the pupils.

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

"Mr. Cassia." Kolyux, one of the protection members, pointed to a direction and said, "Slova and I both recommend this direction. The terrain is flat and the pollution concentration is relatively low. There are underground creatures, and the strength and quantity should meet your requirements."

"Thank you." Cassia said politely.

Then, the three were swallowed by the darkness of the cavity of this underground world.