The ninja suddenly vanished.

All the breath is all hidden.

Even with the near-omnipotent Nagura energy, there is no way to determine the location of the ninja.

That's what a ninja is best at - lurking.

If he didn't move at all, no one would have noticed them.

Not even a ninja can find any other ninja.

Unless it's a ninja who starts the action.

Liu Zhenbei turned a blind eye.

What else can you do?

As long as you move a little, I'll slap you to death!

Keep working hard.

The 704-mm heavy gun began to change its firing stance.

The previous shots, which were parabolic curve shots, were mainly aimed at destroying ground targets. Now it's going to change the Ground Piercing Bullet attack almost straight up and down.

As a professional self-propelled super-heavy artillery, there are many types of battering ram shell modes.

Ground-penetrating bombs are one of the more common ones.

As the name suggests, the main function of the Ground Penetrating Bomb is to attack the dungeon.

Due to the widespread presence of dungeons, many high-powered weapons are unusable. The ground-penetrating bomb was invented.

Ordinary energy bars, which are in the shape of round sticks, are difficult to penetrate deep underground.

The ground-penetrating bomb, which is conical, is essentially an energy gyroscope that can be rotated at high speed to break through.

If a high-speed spinning cone hits the ground at thousands of revolutions per minute, the effect will be very amazing.

The greater the mass of the projectile itself, the faster it spins, and the deeper it will burrow into the ground. Generally, it can reach about 120-150 meters. In rare cases, it can even reach 300 meters.

If the depth of the dungeon is only about 150 meters, it is easy to be attacked by ground-penetrating bullets.

However, the firing speed of the ground-penetrating bomb is also relatively slow.

It requires a lot of Naqoura energy.

If it is fully charged, it will take an hour.

If you use a hedron array, you can reduce the time to half an hour. It's a pity that the cost has skyrocketed.

Xia Luoxi didn't know where to get the battering ram heavy artillery for Liu Zhenbei. This model of heavy artillery does not have a hedron array. There is only one single Nagura spade.

Because it is a relatively old model, the ground-penetrating projectile fired by the battering ram can only penetrate into the ground at a depth of about 90 meters. For most of the dungeons on Hornor, the threat is not great. Because if the depth is not more than 100 meters, the destructive power of the underground rock formation is relatively limited, and it is impossible to destroy the underground city at all.

The massive 704 mm barrel slowly rises.

The angle is constantly approaching vertical. Infinitely close to vertical.

The firing principle of the Ground-Penetrating Bomb is very simple, that is, the Ground-Penetrating Bomb is launched almost vertically upwards, and then it is free-falling, and then uses Naqoura energy to add rotational speed to it.

The ground-penetrating projectile fired by the battering ram will rise about 18,000 meters, then turn upside down, and then fall freely, landing at a vertical speed. At this time, if there is external energy that urges it to rotate at high speed, it will be able to burrow deep into the ground. The main destructive force is related to two parameters: mass and rotational speed.

It is definitely not an easy task to destroy a dungeon from the outside.

Otherwise, there will be no need for a professional dungeon mecha. Fight by numbers.

"Haha! I'm so scared! Mr. Turtle made no secret of his contempt, "Liu Zhenbei, I thought you would have some tricks!" I didn't expect that the method you thought of was so cliché! In the past few hundred or thousands of years, others have long studied the ground-drilling bomb thoroughly. It's not as useful as you think! ”

Liu Zhenbei didn't say a word.

He was concentrating on digging into the ground.

It's a strange weapon. He had never used it before.

What's even worse is that the 500,000 names on the obelisk, no one has studied the ground-penetrating bomb in depth. The obelisk also has no way to extract useful information.

In other words, now he can only operate according to the instructions.

The problem is, there is no instruction manual.

I had no choice but to think about it slowly.

"Do you know how deep my lab is hidden underground?" Mr. Turtle continued.

Liu Zhenbei still didn't say a word.

The research on ground-penetrating bombs seems to be progressing well.

After all, the principle of its launch is not very esoteric. It's just that the parameters are not easy to control.

But, in general, the bigger the parameters, the better.

The bigger the quality, the better.

The higher the rotation speed, the better.

The higher the launch rises, the better.

"Seven hundred meters! My genetics lab is 700 meters from the ground! Mr. Turtle said coldly, "The deepest, 1,800 meters underground!" What kind of ground-penetrating projectile do you think can reach such depths? ”

Liu Zhenbei remained silent.

He couldn't answer! He didn't know the answer either.

He didn't know what kind of depth he could reach with the ground-penetrating bomb he fired.

However, he will go out of his way to fire ground-penetrating bombs.

"Come on! I'm waiting for you to drill into the ground! Mr. Turtle made no secret of his contempt, "I'll wait to see how deep your drill can reach!" Ha ha! A hundred meters? Two hundred meters? Three hundred meters! If it's 300 meters, I'll take it off for you! Ha ha! Battering ram heavy artillery! The historical record is only 130 meters! ”

Liu Zhenbei continued to say nothing.

He seems to have some experience with the ground-drilling bomb.

"Smack!"

The barrel was raised into place.

Fixed latch closure.

Charged.

Charge Wildly!

The volume of the ground-penetrating bomb is small, but the compression ratio is very high.

It seems that the energy compression multiple of the 406 mm energy bomb is about 16 million times. However, the energy compression multiple of the 704 mm ground-penetrating projectile is more than 49 million times!

All things considered, the power of a 704-mm ground-penetrating bomb is about equivalent to a 500-ton high-energy TNZHA yao.

It suffers from its small size. And it must be conical.

If it's a 29-meter energy bar, that's amazing.

Charged.

Keep charging!

One second!

Two seconds!

Three seconds!

Liu Zhenbei was secretly frightened.

This recharge rate is simply unexpected. Haven't been fully charged for three seconds?

You know, there are 500,000 names on the obelisk now! 500,000 names activated the Nagura spar together, and actually condensed a ground-penetrating bomb in three seconds?

Four seconds!

Five seconds!

Finally, the Ground Penetrating Bomb has been recharged.

Liu Zhenbei also understood at the same time. It's not a matter of your own energy.

It's a matter of the energy infusion of the bomb itself. Its special structure gave his vast energy no chance to play at all.

It's like the water of the Pacific Ocean, if it can only be transported through one pipe, it will take a long time. The determining factor is not the amount of seawater, but the size of the pipes. The Ground Penetrating Projectile itself is too slow to receive energy. Unless it's a modification of its structure. But very precise calculations are required.

Launch!

"Poof!"

A violent fluctuation of energy.

Conical ground-penetrating projectiles were fired from the barrel of the cannon, piercing into the air like lightning. 11 166 Reading Network