In the following time, Gu An demonstrated the process of how to build a signal transmission station in front of Siren with practical actions.

Not only that, but she saw Gu An took out shells and a bunch of unknown substances from the pocket of her clothes, and also dismantled the guns and ammunition provided in the supplies, extracted unknown substances from them, and mixed them together, like a Is to make some large weapons.

But Siren didn't expect that while Gu An built a signal station, he also built a gunpowder!

"Is this gunpowder?"

Siren asked in disbelief when he saw the formed gunpowder appear in front of his eyes.

Originally, when she saw Gu An dismantle the grenade, she still thought that Gu An was a wreck. But unexpectedly, she turned her head and built a more lethal weapon!

Grenades can only cause a certain number of casualties, but gunpowder can magnify this number infinitely.

Even let the entire herd be buried under the gunpowder!

Gu An rarely explained to Siren:

"Gunpowder is mechanically mixed with potassium nitrate, sulfur and charcoal. The shells on the beach contain calcium carbonate, and the main component of the ash left after burning is potassium carbonate. Adding nitric acid during the test can extract potassium nitrate.

Although the organizer did not let us bring any weapons to the island, I brought nitric acid. "

Before boarding the plane, the organizer has professional weapon testing equipment to prevent contestants from carrying weapons to participate in the competition.

But this does not include nitric acid.

Not to mention, as early as the very beginning, Gu An had used these nitric acid to change it into other shapes and carried it on his body, avoiding the instruments and everyone's eyes at the same time.

"And what about sulfur?"

Gu An raised his eyebrows: "Have you forgotten that the southwest coast of this island does not grow any grass?"

Just a simple sentence, suddenly let Siren figure out the joints.

The southwest coast of this island is indeed as Gu An said.

Compared with the dense forests in other parts of the island, there is no grass there. It is precisely because the volcanic magma flows into the sea and contacts with sea water to produce a cloud of hydrochloric acid. The rainwater that falls in that area due to the cloud of hydrochloric acid is acid rain, which makes the plants there very Difficult to grow!

And sulfur is formed naturally after a volcanic eruption!

While riding the parachute yesterday, Siren had inadvertently glanced at it and left a hasty impression in his mind.

But the torrential rain at that time was very dense, and her mind was on how to control the parachute. How could she think from a bald coast that there was actually a small volcanic crater buried there?

"No, how do you know there is sulfur on this island?"

Gu An looked at her as if looking at a mentally retarded: "Learn more geography and you'll understand."

Siren's eyes widened: "So, you were prepared to make gunpowder from the beginning?"

When he asked this sentence, an unprecedented shock flashed in Siren's heart.

If so...

Then, Gu An is really scary!

The island is blocked from the signal, and there is no signal transmission station?

Made by Gu An.

The weapons provided by the organizer are only pistols, grenades, no gunpowder?

Made by Gu An.

Are there any medical medicines on the island?

Made by Gu An.

...

In a short period of time, Gu An proved with practical actions that only Siren could not have imagined, and there was nothing she could not create.

OMG!

What kind of monster is she? !

Siren had only heard of Gu An's participation in the Harvard event in the United States, which caused a violent sensation in the entire medical community.

Made all kinds of drugs, she endured it.

But who can tell her why Gu An still builds signal transmission stations and gunpowder?

Is that human being?

This is nothing short of a science monster!

At first, Siren was skeptical about what Gu An had built, until she saw that the signal transmission station's indicator light was on, and then, the signal transmission station transformed by Gu An's wristband directly connected to the phone. The connection between Huo Tingxiao!

His grandmother's, this is not only a signal transmission station, but also has the communication function of a mobile phone?

Siren was completely dumbfounded.

Not to mention, at this moment, her whole mind is still immersed in the shadow of Gu An asking her to study geography.

God, what the **** is this monster? !

If their future mistress of the Southern Fighting Army is such a person, it seems... not a difficult thing to accept.

At that time, Huo Tingxiao, who was planning to mobilize men to attack the uninhabited island, received a communication from Gu An.

The girl's calm voice sounded word by word:

"The organizer is very likely to conduct a biological experiment on this island. In addition, it is not excluded that they set a trap to deal with you. Prepare a helicopter, 135.435682 degrees east longitude, 3 degrees north latitude, this is where I am now precise location."

Huo Tingxiao remembered the numbers clearly in his mind, and immediately asked, "An An, are you okay?"

At any time, the man's first concern is always her safety.

Gu An said with a smile: "I'm fine, you don't have to worry."

The gentle voice seemed to give a boost to Huo Tingxiao's worried heart, making him full of strength again.

Huo Tingxiao instructed, "I sent people to infiltrate the contestants on the island, and I will send them your address. Before I arrive, they will go over to protect you."

Those people have the unique marks of the Southern Fighting Army, and Gu An can use these to confirm their identities to prevent spies from mixing in.

In all aspects, Huo Tingxiao thought about everything.

Gu An nodded: "Okay."

Huo Tingxiao said affectionately, "An An, wait for me to come to you."

There was a slight smile on the corner of the girl's mouth, and a warm current surged in her heart: "Okay, I'll be waiting for you."

No matter when, as long as Huo Tingxiao was around, she would always feel very at ease.

Whether it was before or now.

They are not together, but their hearts have always been connected and never separated.

...

Siren looked at Gu An who could build both a signal transmission station and gunpowder. The most important thing was that she had a boss who would not hesitate to "cheating" but also protect her by her side.

The blond and blue-eyed ruthless killer couldn't help but cursed in his heart:

Damn, this world is really unfair to his grandma!

She also wants to enjoy the sweet care of the boss!

woo woo woo...

Under the ruthless killer shell, didn't the boss realize that she also has a soft girl's heart? !