Wang Tiezhu was also in a hurry to prevent himself from slipping off the plesiosaur's body.

Obviously, the plesiosaur sank directly under the water surface without any warning.

Plesiosaurs swim rapidly underwater.

It turns out that this is far from being as simple as a lake. There is actually another world under the water, connected to an underground river.

The plesiosaur is rushing forward in the underground river.

Fortunately, Wang Tiezhu, Qiu Chen, and Beiye Bing'er are all transformation warriors. They use the breathing method in the water to form a self-circulating sky in their bodies. Moreover, they can also absorb oxygen from the water using the breathing method, so they will not be suffocated to death.

The plesiosaur was very fast underwater, galloping like a sharp arrow. However, even so, it still galloped in the underwater river for more than half an hour.

Wang Tiezhu was shocked. With the speed of the plesiosaur in the water, how far had it traveled in half an hour?

There is no doubt that they must have left District 13 now.

Thinking of this, Wang Tiezhu's heart beat loudly.

Doesn't this mean that they can use this method to leave District 13?

People in District 13 must have never imagined that there would be an underground river under that waterfall for people to escape from District 13, right?

In fact, how could District 13 not know?

The Thirteenth District has been established for so long, and the people of the Blackwater Security Company are well aware of any surrounding terrain. There is an underground river, and they naturally know it.

However, they knew in their hearts that those people imprisoned in District 13 had no way of knowing that there was an underground river there.

The reason is very simple, few people dare to break into such a deep position.

When you get here, you will encounter many terrifying beasts along the way, which are enough to easily tear people into pieces.

Even if you are lucky enough to come here, this is still the territory of the plesiosaur. If you enter the water, it will become the prey of the plesiosaur.

Although this is a passage out of District 13, it is guarded by a plesiosaur, a big guy who can be called the overlord in District 13, making it impossible to escape.

About forty minutes later, the plesiosaur suddenly accelerated and began to rush upward.

At this time, Wang Tiezhu discovered that they were at the foot of a big mountain.

The lower part of this mountain is in water.

And just under the underwater part of the mountain, there was an extremely huge cave, and the plesiosaur rushed directly into the cave.

After rushing into the cave, the plesiosaur continued to swim upward.

Is this cave empty inside?

Wang Tiezhu quickly came to this result.

Sure enough, the next moment, the plesiosaur had rushed out of the water.

At this time, Wang Tiezhu discovered that the mountain was indeed hollow, and within the hollow mountain, there was a large space without water.

At the same time, there is air here.

Wang Tiezhu exhaled a long breath.

Although they can use the secret method of running in the water to get oxygen from the water, they still feel obviously stuffy. How can they feel as good as taking a big breath of fresh air?

After arriving here, the white tiger and the plesiosaur became excited.

Soon, Wang Tiezhu discovered a strange place.

I saw that there was an area on the mountain wall without a cliff, but with strong energy fluctuations.

Energy barrier?

Wang Tiezhu was slightly shocked.

This kind of method is simply not something that people in today’s world can do.

The white tiger jumped off the plesiosaur's head, pointed at the place with strong energy fluctuations, and kept making gestures.

Wang Tiezhu nodded, as if he understood what Bai Hu meant.

Bai Hu wanted him to break through the energy barrier.
Chapter completed!