While the fierce confrontation on Dulo Island was in Luzon. Not far from the east coast of the island, a group of alien warships are quietly diving.

In order to disguise their tracks, the alien warships sailed almost close to the bottom of the sea, and soon after, the alien warships arrived in Luzon. Island, part of the battleships slowly floated, and the remaining battleships sank directly to the bottom of the sea.

As soon as the alien battleship surfaced, it opened its hatch in the churning waves, and a swarm of giant insects flapped their wings and flew into the sky, swarming towards Luzon. Island.

At the same time, the underwater alien warship also released a batch of aquatic giant insects. They look very similar to lobsters, sinking to the bottom and waving two huge claws, digging a hole in the ocean floor that leads to Luzon in a few clicks. A hole in the depths of the island.

As soon as the alien warship on the surface of the water released the swarm, the radar on the island detected an anomaly in this direction and immediately sounded the raid alarm.

Luzon and Dulo are only a dozen kilometers apart, and since the southeast cluster was attacked by servants on Dulo Island, the whole island of Luzon has entered the most vigilant and always vigilant against the swarm flying over the Dulo Strait.

It was very easy to fly across the strait, but the aliens planned to do so, so they resorted to the easy things and dragged the main force of the southeast cluster with the swarm of insects on Dulo Island, and sent another fleet from Luzon. Landing on the east side of the island, preparing to take the island garrison by surprise.

The aliens were worried that the defenders on the island were not easy to deal with, and they deliberately divided their troops into two ways, the group of giant insects in the air was cannon fodder at all, purely to attract the attention of the island defenders, and the group of giant insects that dug holes and infiltrated under the water were the real main force of attack.

Where did the defenders of the island know the aliens' plans, and after discovering the insect swarm in the air, they immediately entered the first level of combat readiness, and the infrasonic cannon hidden in the jungle was immediately ready to fire.

The North was well aware of the capture of Luzon. The island is not the goal, defending this island and preventing it from being used by aliens is the real goal of the Southeast Cluster.

To this end, the military took control of Luzon in the southeast cluster. After the island, a series of emergency measures were carried out, and temporary sonic stations were built at various key locations, and fixed infrasonic weapons were used to control the island's roads, beaches and other strategically important locations.

The construction of the station was not an easy task, first of all, the infrastructure on the island was so badly damaged that it could not be used at all, and all the works had to be solved by the southeast cluster itself.

In order to build a sonic defense system as soon as possible, the Southeast Cluster has adopted a series of powerful measures.

First of all, the main body of the building is poured with high-grade cement, and the building standard refers to the fortress building to ensure the solidity of the sonic station.

Secondly, each station is equipped with a set of solar panels and high-density batteries, and a diesel generator is also provided to prevent the rainy season from being exposed to sunlight for a long time.

Thirdly, the infrasonic generators are placed far away from the sound wave station, and each sound wave station controls five to six generators, and the effective killing radius is calculated as five kilometers, and after all the generators controlled by one sound wave station are activated, a huge area of up to more than 400 square kilometers can be controlled.

Note that the effective kill range of infrasound waves is not an absolute kill range, it is a combination of an absolute kill radius and a drive radius.

To put it simply, only the vicinity of the sound source can shock the target for a short period of time, and after the distance is widened, the sound wave will only make the target feel extremely uncomfortable, producing a strong expulsion effect, and must stay for a while before being injured by the sound wave.

Again, all stations use radar control equipment, which simply means that once the radar is directed at the swarm, the sonic cannon is automatically activated.

In addition to the above preparations, each station is equipped with a squad of guards, and the combination of people and equipment minimizes the chance of error.

Did the Youzhou battle group leave casually? Of course not, the reason why the Youzhou went south to Duluo Island was because of Luzon. The island's infrasonic defense system has been initially completed, and even if there is no mobile force to protect it, the island's sonic station can give the enemy a good drink.

The southeast cluster controls Luzon. The island is not long, and it is impossible to build sound wave stations all over the island, and the sound wave stations that have been built so far can only control key areas.

In other words, it is to use a sonic station to put the whole of Luzon. The island is cut into several large pieces, and the whole island is blocked with points and areas, and even if there is a swarm, there is no way to break through the blockade of the sonic station.

When the military pours out, it's not too late to repair the sonic stations all over the island.

But what does it matter? The sonic station towering over the jungle is simply a nail left on the island by humans, and the aliens want to retake Luzon. Island, you must first unplug the sound wave station on the island, otherwise no matter how many bugs there are, you can only be divided and surrounded by the troops defending the island.

Sure enough, as the military expected, the swarm flew into Luzon. After the island, they immediately pounced on the nearest sonic station, and before they could fly over the sonic station, the insect swarm crossed the radar cordon, and the automatic control system immediately activated the infrasonic cannon.

The swarm flies a bit low, just at the edge of the infrasonic cannon's effective kill range, and the sonic doesn't shoot down the giant bugs, only forcing the swarm to fly higher.

The insect swarm in the air did attract the attention of the defenders, no one thought that there was another group of giant insects underground, but the giant insects in the air were really unlucky, and it happened that the Languan flew over Luzon Island, and just when the insect swarm was about to fly above the sound wave station, a series of lasers fell in the air, killing all the giant insects above the clouds, and countless giant insects fell from the sky.

In order to expand the striking area and increase the duration, the Languan reduced the firing intensity of the laser cannon, and the beam did not scorch the giant worm, but it could completely burn the worm's wings.

Anyway, the bugs fly so high, it's definitely not good to fall from the sky.

The soldiers at the sonic station were observing the situation outside, when they suddenly noticed a swarm of giant insects piercing through the clouds, and then a large number of giant insects fell through the dark clouds like a torrential rain, and fell heavily into the jungle not far away.

A series of dense explosions instantly sounded in the jungle, more lively than setting off firecrackers in the thirtieth day of the Chinese New Year's Eve.

The explosions were even more connected in the jungle, as if a whole group of cluster bombs had fallen into the jungle at the same time, but in just a few seconds, the jungle was emptied by the dense explosion.

The soldiers who witnessed this scene were terrified, no matter how strong the sonic station was, it could not withstand the continuous bombardment of so many giant insects, and if the swarm landed closer, it would just cover the sonic station......

The fighters invariably fought a cold war.

Languan clears Luzon. After the insect swarm above the island, it covered a wave of Duluo Island, and this time it was not so lucky, the falling giant insects were too dense, and the armored vehicles under Qi Jingwen's command were destroyed by the dense explosion.

Through the dark clouds in the sky, there are very few giant insects that can find the target, all the destroyed vehicles are blind cats and dead mice, and if the weather is clear, the losses of the ground forces are definitely more than that.