The missiles pushed into the tunnel slid down into the depths of the tunnel under the push of the flatbed truck.

Although it is a missile, because the tunnel is not a complete branch line, a flatbed cart is still needed to send the missile to the appropriate location and cannot be ignited directly at the entrance of the tunnel.

However, the military made preparations in advance when designing the tunnel. The tunnel, which is more than 4,000 meters long, has a vertical depth of 1,500 meters. Although the last section has not been completely completed, it has met the initial design needs and can ensure the use of the nuclear bomb.

As for the military's request for Chen Xin to transform the missile, it was to penetrate the last 100 meters deep strata to achieve the purpose of directly detonating the nuclear warhead in the alien biological nest.

Although launching missiles in a tunnel sounds incredible, as long as the tunnel is straight and long enough, the missile can remain stable after ignition, and letting the missile ignite and launch it in the tunnel is not impossible.

Although this is as dangerous as driving an airplane through a tunnel, any change and jitter in the airflow may cause the missile to deviate from the predetermined trajectory and hit the tunnel wall and affect the hit, this is still feasible after all.

This ground-based missile, which has been upgraded and modified by Chen Xinzhi, has been specially optimized in this regard to ensure that the missile can successfully reach the bottom of the tunnel and penetrate more than 100 meters deep strata, and send the warhead carrying nuclear bombs into the nest of alien creatures.

The speed of the flatbed car is constantly accelerating. Although there is no man driving, through remote control, the modified flatbed car has gradually approached its speed limit.

"Power Rocket ignites!" In the remote control room on the other side, the flatbed car had reached the predetermined depth, and the booster rocket installed on the flatbed car for acceleration began to work, further increasing the speed of the flatbed car.

At this moment, people in the remote control room seemed very nervous. It was the first time they did this kind of thing. They had never done any exercises before. Everything was just a solution derived through computer simulation. At most, they had only run a few simulation tests in Chen Xin's virtual system.

This is the first time in practice.

However, this first practical operation was practical.

So no one dares to promise that this time will be successful.

But equally, everyone knows that this missile launch will not allow any failure.

The reason is also very simple. What they fired was not an ordinary missile, but a strategic nuclear missile of million-ton equivalent level. Once the location of the explosion deviates, it is difficult to complete the scheduled tasks. The other impact is a responsibility that no one can bear.

However, with Chen Xin's upgrade and adjustment of the missile, the entire launch process has also undergone several simulation tests. In theory, there will be no problem.

Just as everyone was sweating, the staff responsible for reporting the situation suddenly shouted loudly: "The missile is about to enter the horizontal section!"

"The first stage boosts the rocket separation!" The person in charge of the launch also issued his own order loudly.

This order was executed accurately. While the missile entered the horizontal section, the first stage booster rocket, which had completed acceleration work, was successfully separated from the flatbed car, and at the same time, the second stage accelerating rocket was also successfully ignited.

According to the scheduled plan, the first-stage rocket boosts the flatbed vehicle equipped with missiles through the first obliquely downward tunnel. After entering the horizontal section, it accelerates the second stage. After leaving the horizontal section, the missile itself will start igniting, and then go down all the way to the bottom of the tunnel.

The reason for this arrangement is that no one has fired missiles in the underground tunnel. There is another horizontal section of the tunnel built to expand into a logistics base in order to allow the troops to invest better in combat. Naturally, the missile cannot be directly ignited and flew by itself.

However, when the missile leaves the horizontal section, the missile itself will be separated from the flatbed vehicle after it is ignited, further increasing the speed.

This is also to increase the speed of the missile as much as possible. After all, in the tunnel, due to the influence of all aspects, it is impossible to allow the missile's speed to break through the sound barrier. Therefore, in order to increase the speed of the missile as much as possible, it can only be achieved through multi-stage rocket acceleration to increase the speed of the missile as much as possible.

The missile's own engine has been adjusted. Although it will not accelerate the missile's speed to break through the speed of sound, it will also make the missile's speed as close to the speed of sound as possible to provide it with more kinetic energy.

As for how a missile that has not reached the speed of sound will penetrate more than 100 meters of strata, this is what Chen Xin needs to achieve in his transformation.

In fact, the principle of the missile's ground-boring warhead is similar to that of the armor-piercing missile. They are made of softer materials. After hitting the target, the inner warhead made of hard materials wrapped in the outer shell uses powerful kinetic energy to penetrate the armor or formation.

However, Chen Xin used some brain-like designs on this missile. When the missile hits the target, the hard armor-piercing warhead carrying a nuclear bomb inside it will be shot out like a shell in the barrel, allowing its speed to break through the speed of sound and obtain enough kinetic energy to penetrate more than 100 meters of the formation.

Of course, this design is not something that is found on serious missiles. It is completely a forced upgrade by Chen Xin with his brainstorming ideas and then using the system upgrade function.

After all, no missile will consider launching in a tunnel, let alone how to break through a nuclear warhead more than 100 meters deep, and detonate it more than 1,500 meters deep underground.

As for why the missiles must be accelerated after Chen Xin upgraded and transformed, it is to allow the missile body to penetrate the pile of corpses of dozens of meters long silted at the bottom of the tunnel.

Of course, these corpses are not as hard as the strata, but the gaps between a large number of corpses and the softness of the corpses themselves are excellent buffering materials. If the missiles cannot be accelerated to a certain extent and forcibly penetrated these corpses, the missiles will be stuck in these corpses.

In this case, even if Chen Xin upgraded warhead can penetrate the formation, it will be affected, losing a lot of kinetic energy, and may even be unable to penetrate the formation.

With the support of these measures, the missile finally plunged into the corpse at the bottom of the tunnel, and with strong thrust, it penetrated the layers of corpses and reached the bottom of the tunnel.

"Bang!" A ground-boring warhead that was much thinner than a missile was shot out from the top of the missile and instantly drilled into the formation.

Then... the people in the remote command room felt the earth shaking under their feet.
Chapter completed!