Xia Li took out the password suitcase that her father had placed with her.

The entire suitcase is black and metallic, and the seams are tightly sealed, and only one combination lock can be unlocked.

Xia Li looked left and right with the box in his hand, his brows furrowed unconsciously.

I was a little skeptical, was this really what those people were looking for?

The combination lock sounds quite lofty, but it is actually not difficult to solve.

Even if the combination lock on this box is perfectly matched with the box itself, there is no way to remove it violently by turning screws.

Xia Li wasn't sure what those people were looking for, so he didn't think too much about it.

He pulled out a flashlight from the space and lit it up through the gap in the cipher disk.

Sure enough, a small groove was found in the gap of the cipher disk, which was not very obvious, but it was indeed there.

The number corresponding to each of the three cipher disks is ninety-two-six.

Xia Li pulled the unlock button and didn't open it.

Turn all the numbers on the dial to the right, and pull the unlock button again, but it still doesn't open.

I tried it five times in a loop, and when Xia Li pulled the lock button again, the button was pulled open.

Xia Li: ......

I feel more and more unreliable, isn't this lock too simple?

Because it was too simple, Xia Li's precautionary psychology instantly rose to a height.

The backwardness in science and technology does not mean that China is backward in the inheritance of its ancestors.

What if the lock on the outside is just to hide people's eyes and ears, and as soon as the box is opened, "Xiu Xiu Xiu~" pops out several arrows in his sleeve and goes straight to the front door?

Xia Li was worried, stood up and walked to the side of the box, retreated a little, and slowly picked up the box with a small wooden stick.

"Smack!" Like a clam shell, the box was flipped open, and the lid on top smashed against the table, revealing a wad of white A4 paper inside.

However, nothing happened.

Xia Li: ......?

For a while, she didn't know if she was looking in the wrong direction, or the person hiding things was too perfunctory, or the current level of the combination lock was like this, everything was because of the fault of the later generations who were too developed.

When Xia Li saw this scene now, his first reaction was that this pile of paper was likely to be poisonous, and whoever touched it would die.

Otherwise, isn't this anti-theft system a little too "low-key, unpretentious, and useless"?

But if you think about it, you know that she thinks too much, this possibility is extremely small, and normal people will not smear poison on the paper in order not to let others see it, instead of doing things on the anti-theft system.

Even if you poison a person, can't others still wear gloves and continue to watch?

Silently lit a piece of wax to himself who had been terrified for a long time, Xia Li picked up the pile of paper from the box and looked at it carefully.

This pile of paper is a sketch of the various mechanical structures and assembly methods on it.

Whether it is in terms of material remarks or how to fit together, it is clearly drawn and extremely detailed.

Xia Li read it once, and he could basically confirm that this was a document on the manufacture of close defense artillery.

Although it is only a semi-finished product, it has already begun to show its scale.

Xia Li remembered that the close-in artillery mount was the last line of defense on the warship, used to intercept incoming anti-ship missiles.

Historically, the world's first short-range defense weapon system was the AK-630 six-barreled 30-millimeter gun produced by Mao Ziguo in 1970.

The Huaxia project design began in 85 years, and it was only applied to warships in 90 years.

If this information really existed in history, the time for the creation of close defense artillery in Huaxia would definitely not be postponed until that late.

Xia Li's face was a little ugly when he saw this information.

So this is what her dad has always wanted to protect?

If she has traveled through real history, then why does Huaxia have this design scheme for the close-in defense artillery that has begun to take shape, but the manufactured close-in defense artillery was only applied in the nineties?

The reasons for this can be imagined.

Thinking of his parents, Xia Li's eyes were a little sour, and he didn't dare to think about it at all.

Pursing his lips, he doubled the entire document on the table, crumpled it into a pile, and put it in the lockbox again.

The moment his hand touched the bottom of the box, Xia Li's hand suddenly stopped.