Just as the special service team was taking time to rest, in another fortress building No. 41 not far away, the defenders were engaged in a fierce battle with the swarm.

Building 41 is located in the middle of the Northern Line and is part of the third line of defense of the Northern Line.

Earlier today, the fortress building in front of Building 41 fell into the hands of the swarm, and the swarm gained a springboard for attack, and from that time on, Building 41 became the front line to face the swarm head-on.

The defenders in the building have long been ready for battle, and all the officers and soldiers are ready for battle, especially the underground passage leading to the front, which is the top priority to defend against the swarm.

The swarm moved very quickly, and it didn't take long to find the underground passage leading to Building 41, and a small group of giant insects approached Building 41 through the underground passage, and came to conduct a small fire reconnaissance.

The cameras placed in the underground passage sent the swarm's movements to the defenders, and when the swarm approached the exit, the defenders stuck the time and threw a few white phosphorus grenades directly into the tunnel.

Phosphorescent light suddenly flew away in the dark tunnels, and flames burned everywhere.

Most of the attacking insects were killed and wounded, and it became the merit of the defenders, and the few giant insects that escaped quickly retreated, and the temptation of the insect swarm came to an abrupt end.

Not resigned to defeat, the swarm soon organized a second round of attacks.

This time, the Zerg sent the most classic Giant Worm tactical combination, that is, the beetle was in front, and the jumping worm stinger followed.

If it weren't for the lack of tunnel size, the insect people would have to stuff the heavy light insects into the tunnel.

The defenders were still waiting for the white phosphorus incendiary bombs, but the giant beetle was covered with white phosphorus, and continued to rush forward regardless of it!

The carapace of this thing is heavy, and no matter how powerful the white phosphorus incendiary bomb is, it will take some time to burn through the shell.

How can the defenders look at this? If the giant beetle rushed out with a body of white phosphorus, there would be no need to fight this battle.

So the commander gave an order, and the flamethrower immediately opened fire on the tunnel, and a fire dragon instantly penetrated the tunnel.

Well, no matter how much the giant beetle burns, it can't withstand the flames all over the tunnel - even if the shell of the giant beetle can withstand it, they still have to breathe, right?

The tunnel was burning so hot, the oxygen was burned out, and the giant beetle couldn't suffocate without thinking about it.

There is also the air in the tunnel that is heated by the flame, not 1,000 degrees Celsius to 800 degrees, so the hot air is sucked into the stomach, and the trachea or something is cooked on the spot.

And the carapace of the insects can't stop the heat, don't look at the flames in the tunnel only burned for a few seconds, but the insects inside must all be dead.

Two times in a row, it was very easy to block the insect swarm, and the soldiers said that it was easiest to fight the insects by guarding the tunnel!

However, ease is only relatively speaking, whether it is a white phosphorus incendiary bomb or a flamethrower, it is not such a safe weapon - the smoke produced by the combustion of the former is poisonous; The latter not only consumes a large amount of oxygen, but once oxygen is insufficient, carbon monoxide will be generated, which directly threatens the lives of the fighters.

The defenders had been prepared for this, and each soldier guarding the tunnel carried a high-pressure gas cylinder on his back.

The flames destroyed not only the giant insects, but also the monitoring equipment placed in the tunnels. However, this is only a minor annoyance, as long as you wait for the flames to go out, send a few drones into the tunnel.

There was no combustible material in the tunnel, and the flames only burned for a few minutes before slowly extinguishing, but the high temperature left by the burning remained in the tunnel, and it took a little time for the temperature to come down.

After waiting for more than half an hour, the temperature in the tunnel finally normalized, but the defenders were surprised to find that the insect swarm was honest and had no intention of attacking.

The warriors are amazed, and the bugs still have a long memory?

They know that aliens rely on insect people to command the insect swarm, but in the past, whether the insect swarm was commanded by the insect man or not, they would hit the south wall and never look back, how is it different today from before?

The commander of Building 41 was very alert, he immediately realized that the situation was not right, and immediately ordered several fighters to listen to the sounds underground.

The defenders did not have special listening equipment, but on the first floor of each fortress building, there were several "earth tanks" dedicated to listening to sounds.

The so-called ground tank is a water tank embedded in the ground, and anyone who has watched "Tunnel War" must know this thing.

Although the earth tank is indeed a little dirty, but the method of soil is not the point, the point is that this method is effective, as long as there are insects digging holes in the ground, how much can be heard some movement, and several earth tanks are combined together, but also can roughly distinguish the direction of the sound.

The fighters soon heard the sound of bugs digging holes, and the commander immediately concluded that bugs were digging a new tunnel leading to Building 41!

He knew the general direction of the tunnel, but he couldn't tell where it was, let alone where the worm was going to open the exit.

Out of an abundance of caution, the commander immediately ordered the fighters to retreat to the second floor.

However, withdrawing is not giving up, after the soldiers leave the first floor, they will blast the floor slabs at several key positions on the second floor, one of which is directly above the tunnel, as long as the insects dare to go through the tunnel, it will definitely be burned without discussion!

Probably the insect people also knew this, so even if the tunnel was unguarded, the insects would not leave, and after about twenty minutes, the floor in a corner of the first floor was lifted, and then a giant insect came out.

The place happened to be a dead end, and this scene was not discovered by any of the defenders.

Then the exit expanded, and more giant insects burrowed out of the ground, and soon hundreds of giant insects gathered.

In order to accumulate strength, all the giant insects are waiting here, and when there is no place, they will stack them one by one, and they would rather squeeze than go out.

It wasn't until the room could no longer fit that the swarm rushed out like a flood of bursts, but as soon as they entered the hallway, they were spotted by the defenders monitoring the hallway.

The fighters on the second floor immediately opened fire, and the grenades were thrown down as hard as money, blocking the giant insects in the corners of the first floor.

But the insect people are not vegetarians, and there are several such exits on the first floor, and by the time this is discovered, the swarm of insects has already occupied the first floor.

If it weren't for the flamethrower guarding the passage between the two floors, I'm afraid that the swarm would have already attacked the second floor.

When the swarm didn't come in, it was easy to block, and it was not easy to fight when it entered the first floor, so the commander made a quick decision and ordered the spiral staircase to be blown up, and everyone resisted step by step, doing their best to eliminate the living force of the swarm.

The resistance of the defenders was very tenacious, and the insect swarm attacked several times without results, so they simply repeated the old trick, found a few remote corners, avoided the defenders and chiseled the ceiling, so as to enter the second floor smoothly.

The building standards of the fortress tower are indeed very high, but no matter how strong the floor slabs are, they cannot be as strong as the exterior walls.

The sudden rush into the second floor of the swarm made the defenders very passive, and the defensive deployment was directly disrupted, and the soldiers desperately blocked the swarm, blocking the swarm with more than a third of the casualties, buying time for the others to retreat to the third floor.

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