"Attention all, retreat in batches!" The situation on the scene no longer allowed An Ruoxuan and them to fight, and now it was time to retreat. If the pen "Fun" Pavilion www.biquge.info delayed any longer, I am afraid that there will not even be a chance to retreat for a while. Of course, the retreat could not be withdrawn together, there were people covering in the back to suppress the onslaught of the sword mantis herd.

- There are a total of five large lifting platforms on the 20th floor, which are used to transport large materials and equipment in normal times. Of the five lifting platforms, one is located inside the Tower of Babel and the other four are spaces outside the Tower of Babel. The lifting platform inside the Tower of Babel has now been occupied by the Star Worm, and the only ones that can be relied on are the four lifting platforms outside the Tower of Babel.

The entire underground base as a whole is a huge cube, and the Tower of Babel is a separate cuboid in the center of this cube. Although it is true that the above-ground part of the Tower of Babel is a cylindrical tower, the main body of the Tower that extends underground is indeed a cuboid.

This structural layout was determined by the construction method and process of the entire site, with the central Tower of Babel being built first, and then expanding outward into an underground base. The Tower of Babel can be said to be the core of the entire underground base, and a series of important facilities, including the main engine of Xingtian, are built in the Tower of Babel.

The Tower of Babel itself is part of the Underground Base, which is also divided into 20 levels, each with four entrances and exits that connect to the rest of the Underground Base, and Floor -20 is no exception. It can be said that the current situation is very critical, and the part of the Tower of Babel on the -20th floor has been completely overwhelmed by the Sword Mantis.

An Ruoxuan and the others are now gradually retreating towards the four entrances and exits, only one of the four entrances and exits is now open, and the other three entrances and exits have closed the barrier security doors when the base enters the maximum security alert state.

Although the four entrances and exits are usually open, it is not easy to reopen them once they are on maximum security alert and are closed urgently. The portal connecting each floor of the Tower of Babel has a barrier security door, which is usually not closed.

The thickness and material of the barrier security door are exactly the same as the outer wall of the Tower of Babel, and the defensive power is amazing. It's quick to close, but it's hard to open it again, and no one usually touches it. An Ruoxuan didn't want to risk trying to open the three barrier security doors now, one passage was enough.

Each of the portals connected to the Tower of Babel is not small, and the -20 floor is especially huge. With a height of more than ten meters and a width of fifteen meters, it was enough for five light armorers to pass side by side. Evacuating collectively from the portal that has not yet been closed is obviously An Ruoxuan's best choice for them now.

An Ruoxuan's overall defensive line formation is a fan-shaped, and the only remaining portal is the portal where they entered the Tower of Babel, and it is also a portal that is now behind them, and it can be said that it is very convenient to evacuate. As long as the defense line is gradually contracted now, An Ruoxuan and they can provide perfect cover for the first teammates to evacuate.

An Ruoxuan: The first thing they have to do now is to shrink the defensive line, and each independent triangular formation is gradually moving closer to each other according to the formation, and the combat team members who were originally in the rear began to quickly withdraw from the Tower of Babel under the cover of the front team. After leaving the Tower of Babel, they naturally split into four groups and evacuated towards the four lifting platforms.

The style and specifications of these four lifting platforms are exactly the same, and each one is 10*10 in size. The maximum load is 120 tons, the main power is still the Searle engine, and the speed of lifting and lowering is not fast. The electricity generated by the Thor's generator itself will be sucked away by the energy barrier of the stargate, but its anti-gravity effect will not disappear, and the elevator will still operate normally.

According to the load calculation, each lifting platform can transport eight light mechs at a time, and there is no problem with the size. However, the energy barrier of the stargate still has a great impact on the lift, although it can be lifted normally, but the maximum load has been greatly reduced. If you want to maintain a normal lifting speed, you can only transport up to six light mechs at a time.

Each lifting platform is capable of transporting six light mechs at a time, and four platforms at the same time are twenty-four. If you don't go for top speed, you can transport everyone to -19 in five times.

The transportation of each batch takes nearly ten minutes, and the time is still very tight for An Ruoxuan and them. Once a certain group of team members are entangled and fail to evacuate on time, for the last person to cover at the bottom, the light mecha is likely to run out of energy, leaving them with the result of abandoning the mech and evacuating alone.

All the situations were gathered to An Ruoxuan through the battle network, and An Ruoxuan had some plans for the next action. Either in the retreat or in the front cover, there is no room for a mistake. The triangle formation is no longer suitable for the next defensive work, under the command of An Ruoxuan, all the players changed the formation in a unified manner, defended in the second section, and dealt with the impact of the star insects head-on.

Two-stage defense, the principle is similar to the ancient musket three-stage shooting. All the team members staggered into two rows, stabbing and slashing forward alternately with Mo's knives, firmly blocking the mantis beasts from the defensive line.

As time passed, the team members on the field gradually withdrew from the battlefield, and the pressure on the remaining cover personnel continued to increase, and the original defense line was constantly compressed by the sword mantises. The portal of the Tower of Babel was An Ruoxuan's bottom line, and once the Sword Mantis Beast broke through the portal and came to a wider underground space, An Ruoxuan and their troubles would be even greater.

An Ruoxuan's final plan was to put down the barrier security gate and block the star worm in the Tower of Babel, with a thickness of two meters and a mass of more than a thousand tons, the barrier security gate was far from being able to break through by the Sword Mantis Beast. But whether there will be other star insects that can break through the barrier security door, An Ruoxuan has no heart to think about it now.

As the captain, An Ruoxuan and the three of them were naturally the last to evacuate. An Ruoxuan was even prepared for the worst, abandoning the mecha and evacuating through the elevator in the Tower of Babel. However, the situation was obviously not as bad as An Ruoxuan thought, and when An Ruoxuan and the others had withdrawn more than ninety people, Xingmen finally stopped spitting out the sword mantis beast.

Seeing that Xingmen no longer spit out the sword mantis beast, An Ruoxuan's heart sank. Stargate now stopped spitting out the Sword Mantis Beast was obviously not the reason for the impact to stop, it was more likely that Stargate was brewing a new round of eruption. "Speed up the retreat, and the covering team members should pay attention to increased alert."

As soon as An Ruoxuan's order was issued, the Star Gate changed again. A bunch of star insects the size of ordinary wolfdogs that had never appeared before poured out of the stargate and mingled into the group of sword mantises. An Ruoxuan, who had been paying attention to the movements of the Star Gate, discovered those unknown creatures as soon as possible, "Attention, be careful of those new little star insects in the swarm!" ”