The old dog can swim underwater for a long time with Mei Lan and Ma Shiyuan just by taking a breath. The red ghost's body and appearance have changed a little. Some fish scales have grown on his body and face, so he can breathe underwater and swim much faster than the other three.

When Mei Lan and Ma Shiyuan first saw the changes in the Red Ghost's body, they were extremely shocked. Then they remembered that a colleague had said that the second-level enhanced genetically modified warriors had undergone some genetic modifications. They guessed that perhaps these warriors had been genetically modified to have animal DNA.

Several people swam to the shore, where several guards were patrolling.

The red ghost jumped out of the water and killed all the guards instantly.

Meilan could only float to the surface and walk to the ground. The old dog sniffed the surroundings with his nose and then listened to the movements around him with his ears.

Then he gestured to a few people.

The four of them immediately divided the work and headed towards different directions and locations, killing the local guards.

Then, the old dog continued to use his ears to listen to the movements around him.

Lao Gou picked up the rifle from the waist of the guard he had just killed, walked a few steps, and suddenly turned around, pointing the muzzle of the rifle in a certain direction.

The others immediately pointed their guns in the same direction, and then several rhythmic sounds were heard.

"Tell me your code name?" asked the old dog.

"Chameleon." Then a 2-meter-tall man wearing a Spartan combat suit Type II walked out of a bunker.

"Chameleon, how many days have you been here?"

"3 days, some damage and observation were done in the underground level."

Ma Shiyuan asked, "Did you do all the explosions in the basement by yourself?"

"No, and I am not fighting alone. I am joined by two Level 2 enhanced genetically modified warriors, four Level 1 warriors, two prosthetic warriors, and three ordinary special elite warriors."

Mei Lan asked: "Can we join your small online circle?"

"No problem."

Chameleon looked at Red Ghost and Old Dog and asked, "Where are your Spartan uniforms?"

“It was confiscated.”

"From the looks of you, I guess quite a few of you have been arrested."

After Mei Lan and Ma Shiyuan connected to Chameleon's small circle website, they also pulled Cui Jie and Doshir in.

Mei Lan and Ma Shiyuan learned from it that the environment and roads their companions had explored in the underground layer were even more extensive than the map they had obtained.

Soon, Melan and his companions began to understand the structure of the underground part of the Markarth Fortress, and learned some of their electricity sources. In addition to nuclear power, there are other sources of electricity such as water power, wind power, solar power, etc.

Some power transmission pipelines were destroyed and could not be repaired in a short time. At the same time, some of their underground transportation pipelines were also found.

Although Cui Jie and Doshir did not enter the underground level, they also found other companions on the surface, and now the size of their small circle network is growing.

We have now received news that the Dion army on the front line has suffered a crushing defeat, and the Dion troops are already about 100 kilometers away from the Markarth Fortress.

The three layers of Titan Wall currently have a 100% defensive effect. To weaken it, the best way besides the source of electricity is to find a control console or its device.

One of these devices has now been found in the basement. If destroyed, it can reduce the defensive effectiveness of one layer of the Titan Wall by 15%.

But the problem is that it is heavily guarded. Even if all the people in their small circle network are transferred over there, they only have 30 people at most, while there are at least 2,000 people guarding it, and many of them are using heavy weapons.

Unless most of these people can be transferred away, the success rate is basically zero.

However, it is possible to destroy the power transmission pipes.

The person in charge of Markarth Fortress had long anticipated that the power transmission pipeline would be attacked, so he also made a lot of alternative underground power transmission pipelines. Once they were destroyed, they would be immediately replaced with new ones.

Cui Jie and Doshir also rescued some companions and took back some Spartan uniforms. Some of the Spartan uniforms were either destroyed or installed with nano trackers.

The former can only be thrown away, and the latter should be disposed of if they can be processed. If they cannot be processed, the Spartan uniforms should be destroyed.

Each person or group now has a different plan.

On the other hand, after Yelishade received the news, he immediately took retaliatory actions against some of the rescued Tianyi mercenaries.

Especially the second-level enhanced genetically modified surgery warriors, the damage and losses caused to them were even greater.

After failing to extract any more useful intelligence, Yelishaud ordered all the captured Tianyi mercenaries to be executed.

On October 2, 126 of the Universe Year 1, the frontline troops who had fled into Markarth Fortress after their defeat were attacked by some explosions while they were resting.

In just three hours, several anchorages, lounges, etc. were attacked by explosions, sniper attacks, etc.

This led to rounds of carpet searches inside Markarth Fortress.

The Tianyi mercenaries have already mastered the opponent's search pattern and the information from undercover agents or traitors, thus avoiding every search in various places.

Even some drones, search aircraft, etc. were hacked into the community control console by Tianyi mercenaries, and some data was tampered with.

In addition to the explosions that hit the berths, lounges, etc., many power transmission pipelines, both underground and surface, were damaged.

The commander of Markarth Fortress immediately dispatched maintenance troops to repair the partially damaged power transmission pipelines.

If more power transmission pipelines are destroyed by the Skywing mercenaries, it will definitely affect the operation of Markarth Fortress, especially the electricity required for the Titan Wall.

For safety reasons, the commander not only arranged other troops to protect the maintenance troops from being attacked by the Tianyi mercenaries, but also arranged other troops to protect the power transmission pipelines that might be damaged.

In the small circle network, Lao Gou, Mei Lan, Cui Jie and others had a series of discussions. Some people continued to destroy the power transmission pipelines, while others assassinated people above the school officer level.

Some people also tried to poison the water and air of Markarth Fortress.

The remaining group was waiting for an opportunity to destroy the devices or consoles of the Titan Wall.

At this moment, Yelishade not only had to deal with the sabotage and mischief caused by the Tianyi Mercenary Group within their ranks, but also had to appease the sense of failure that was prevalent within their ranks.

After the defeated troops on the front line fled into Markarth Fortress, the enemy was at the gates of the city. Most of the defeated front-line soldiers had no will to fight, which also affected the other soldiers in the fortress.

Coupled with the numerous explosions and assassinations that occurred in the fortress, many people believed that a large number of enemies had infiltrated.

The word "failure" began to gradually penetrate into everyone's mind, and many people in Dion's army had the thought of surrendering.

In order to calm the emotions of all the soldiers, Yelishaud assured all the soldiers that they would live and die together and advance and retreat together. As long as the fortress was there, he would be there, and the day the fortress was breached would be the day of his death.