Creak, creak!

In the dark cave, the sound of the closing of the serrations made a huge sound, which was frightening. Countless piranhas surrounded the bone boat. They opened their scarlet eyes and showed their fangs. They were very ferocious.

"It's terrible, fat man, we've been hurt by you..."

Jin Buhuan and Bai Hu were stunned. This guy ate crazily as soon as he landed. That's good. Nose blood waded into the water and attracted a lot of piranha!

It can be expected that if the three of them fall into the water, I'm afraid they will break to pieces and be chewed apart before they have time to call the system.

Click!

Shit——

Do you want to be so cruel?!

Stimulated by the bloody smell, the piranha was finally going crazy. Its sharp teeth began to bite the bone boat. As soon as it went down, the bone boat jumped open.

It's over, it's over!

"Abandon the ship!"

The white fox shot a hook into the cave. The whole man floated. Jin Buhuan also took out the Yin claw and hooked the stone above. But Cao pangzi looked confused and forced. Where did he have anything like hooks and claws? In a hurry, he directly hugged Jin Buhuan's thigh and reluctantly left the water.

"Fat man, you are too heavy!"

Kim was still worried that if the hook could not hold their weight, they would both be finished. At this moment, the bone ship finally disintegrated and was gnawed clean.

Looking at this scene, the three swallowed a mouthful of saliva and dared not breathe. At the moment, if they fell into the water, we can imagine the consequences.

After a while, after the bone ship was smashed, the bloody smell gradually disappeared, and the piranha sank to the bottom without movement. For the sake of safety, the three did not dare to go into the water for the time being, so they hung in mid air.

"It seems... It seems all right."

The white fox slowly stretched the iron chain in his hand, and then dipped into the cold water. According to her data analysis, piranha has left this area. As long as there is no blood smell, it should not return.

Poop——

At this time, the fat man and Jin Buhuan also jumped down from the top of the hole and fell into the water. The hot sweat of the two people was finally watered out by the cold water. Looking around, they could only swim back to the previous boulder and make plans.

Because they are not sure what kind of danger is still dormant in the water ahead. The urgent task is to rebuild a ship.

"Did you... Steal some?"

The white fox looked at the two people and said with some embarrassment. I don't know how long she was trapped here. The system has almost been covered with dust. Where can I steal some.

"I want to buy PKC synthetic material, which is a very special material to assemble into a ship, and its stability will be greatly increased."

"Wait a minute..."

Jin Buhuan and Cao pangzi spoke in unison, and then searched the theft exchange. Sure enough, there was such material. Moreover, this material is very rare and precious. Only some advanced plane planets have it.

However, at such a critical juncture, they would not be stingy. They spent a lot of money stealing and bought a lot of PKC synthetic materials.

White fox took these materials, nodded coldly to the three, then took out a series of instruments such as ruler and magnifying glass, began to measure and cast a new ship.

Jin Buhuan and Cao pangzi looked at each other with dull eyes, which was also heartfelt admiration. White fox should be a well deserved scientist. It has very strong practical ability and investigation ability in the field. It is a proper Xueba.

It can be said that this is a woman standing at the top of the food chain.

Under his skillful hands, about half an hour later, a ship similar to steel but hundreds of times harder than steel was cast.

"It's so light and strange..."

Jin Buhuan and Cao pangzi pushed the steel boat directly into the water. Even, it is lighter than the previous bone ship.

"This top synthetic material is not only good in performance, strong, but also small in weight. It is most suitable for ships at the bottom of this kind of underground river."

The white fox knocked the boat with a stone. After confirming that there were no missing places, he got on the boat.

"Now, I'm afraid the piranha can't bite, ha ha!"

Cao pangzi chopped his foot fiercely, and the whole ship shook slightly. Jin Butong threw the oar to the fat man, but he was free for a while. The three men performed their duties and the iron ship went upstream against the current.

Along the way, it was quiet in the cave, and there was no abnormal reaction. Jin Buhuan and Bai Hu investigated the surrounding situation one by one.

They dare not be careless here. This is already the depths of the cave. There are dangers everywhere. If you are not careful, you may destroy the ship and kill people. After being quiet for a long time, there was strange noise around again.

This time, it's still a problem in the water.

"Strangely, the pH of the water is getting more and more acidic."

The white fox sensitively sensed that there was a problem in the water area and tested it with a pH test paper. The acidity of the water was unexpectedly large. Moreover, the deeper the depth, the lower the pH value, until the test paper is completely corroded as soon as it is immersed in water.

"Be careful, the water is... Acidified!"

At this time, the white fox and Jin Buhuan found that there were suddenly many rotten bones in this water area, and there was no movement of any creatures. Even, smoke came out of the water.

"The water here is almost equal to concentrated sulfuric acid. Fortunately, we changed a boat. Otherwise, if we entered this water before, the end would be no worse than being eaten by piranhas."

Sniff——

They found that the ship seemed to be corroded, emitting white gas and even making a harsh sound.

This water area is lifeless and filled with smoke. The color of the water area has also become a little viscous and red, which is almost a piece of concentrated sulfuric acid!

Hiss!

Jin Buhuan took out a metal block and threw it in. In an instant, the metal block melted and bubbled. The acidity of the water is terrible.

It is conceivable that if the human body falls into it, it may be corroded to the point that there is no residue left.

As the ship moves forward, the water becomes more and more viscous, the acidity is also rising, the surrounding of the cave is completely shrouded by white smoke, and the visibility is very low. A pungent sour smell diffuses around, making it difficult to breathe.

Tick——

At this time, the ship's alarm sounded, and the three looked at the distance. The machine actually detected life, which means that there must be someone ahead!

After a while, the same ship appeared not far away, and the people with four golden masks were looking towards this side.

"It's them!"

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