Tang Feng's right hand picked at the gap in the rock wall, trying to keep the balance of his body stable, and then held a strong flashlight in his left hand to shine around, and as a result, Tang Feng's little heart sank to the bottom.

There is an endless dark river in front and behind, and there is an impermeable rock dome overhead, and the opposite side is also a rock wall. In other words, this underground river, which is almost 20 meters wide, is like flowing in a closed pipe, and it is impossible to find a place to go ashore, at least now.

But if you don't go ashore, the water temperature of the dark river is too low, it is estimated that it is only five or six degrees at most, if you soak in the water for a long time, the hypothermia of the body alone is enough to kill Tang Feng.

How did Little Plum on Titanic die in the end? He didn't freeze to death, but died of hypothermia!

Tang Feng didn't want to become a little plum himself, so finding a place to stay ashore was a must.

After thinking about it, Tang Feng squeezed the flashlight between his cheeks and shoulders, freed his left hand to get ready, and then with a movement of consciousness, a behemoth suddenly appeared on the surface of the river. It was a small kayak, similar in style to the kind of raft used for rafting.

The kayak appeared on the surface of the river, and it was about to float down the current, but Tang Feng, who had been prepared, only grabbed the edge handle of the kayak with his left hand, and then kicked his foot on the rock wall, and with another force on his hand, his body immediately jumped into the kayak.

And after the kayak lost control, it immediately drifted downstream along the turbulent dark river, and at that speed, Tang Feng estimated that it would be at least six or seven meters in a second.

Tang Feng, who was in the kayak, finally had his hands free, and the most important thing was that he was now able to control some things. Instead of being helpless like in the water just now, it's like a child without a mother.

Tang Feng's consciousness was linked, and suddenly a lot of miscellaneous things appeared on the small kayak, like a miner's hat with a strong flashlight, like a diving suit and a matching oxygen mask and oxygen cylinder, like a high-strength oar

Tang Feng grabbed the miner's hat and put it on top of his head. Immediately let his vision be guaranteed, and then, Tang Feng neatly took off the coat on his body, put the diving suit into it, carried the oxygen cylinder well, and hung the oxygen mask around his neck, in case he fell into the water again, so that he could bring the oxygen mask as soon as possible.

After this series of actions, the raft drifted at least two kilometers downstream, but what made Tang Feng a little anxious. The course of this dark river is still the same as before, surrounded by closed rocks. But fortunately, there are no messy obstacles in this dark river, which can make Tang Feng breathe a sigh of relief.

The most fearful thing about sitting on this kind of raft is not that the water is fast, but that in the case of fast current, there are rocks and other obstacles everywhere in front of it, such a fast speed, even if this raft is the best quality, but if it hits a sharp stone head-on. It is estimated that it will have to be scrapped as soon as possible.

The environment is like this, and Tang Feng has no way. I could only stare nervously ahead, and the oars in my hand adjusted the direction of the raft from time to time, so that the raft was always in the center of the river.

After drifting down like this for two hours, the current suddenly began to slow down, and the river in front of it began to widen. Let Tang Feng be happy in his heart.

The flow slows down and the river widens, which usually means that there are banks!

Sure enough, after drifting forward for about ten minutes, an extremely spacious "underground hall" appeared in Tang Feng's sight.

This is supposed to be a mountain space formed during the orogeny. It is possible that before the mountain solidified, the gas from the eruption of the volcano converged here, and then formed such a huge space; It is also possible that the mountains have been displaced by geological movements such as earthquakes for hundreds of millions of years, and then the gaps between the mountains have slowly expanded, and they have become what they are now.

The area of this "underground hall" is quite large, that is, it is larger than the underground space full of gas that Tang Feng encountered when he was buried in the ground, at least the strong flashlight above Tang Feng's head that claims to be able to shine fifty meters away cannot see the edge of this hall.

Tang Feng tried to shout, and then a burst of echoes continued to echo back from all directions, which further illustrated the size of this underground space.

Looking up, the top of the rock more than 20 meters high is very smooth, and there are no stalactites that can often be seen in those underground karst caves that Tang Feng has seen. Stalactites are all limestone, and it is impossible to form a rock structure like stalactite, except for hard granite.

By this point, the river had become wider, and it would be better to describe it as a lake than a river.

At this point, the raft was barely drifting with the current, and when I looked down, the water here did not seem to be deep, and the rocks at the bottom of the water could be seen clearly under the light.

Tang Feng Tang Feng was surprised that there were still fish in this underground lake of unknown size

This kind of fish looks very strange, at least Tang Feng has never seen a fish like this. These fish are only the size of palms, wandering in groups in the lake, with two big eyes on the top of their heads, but unfortunately these two big eyes that are the same as goldfish are all gray and white, and they can't even see their pupils. This is supposed to be the result of these fish living in underground lakes without any light for a long time, which eventually leads to the complete degradation of the photoreceptor organs.

Tang Feng didn't dare to touch these fish, who knows what kind of temper this fish that has lived underground for a long time will be? What if these fish were close relatives of the famous piranhas of the Amazon Basin? Don't forget, it's not far from the Amazon, and there's even a tributary of the Amazon just north of Viamontes

Tang Feng slowly put the oars into the water and rowed, driving the small raft to float like one side, rowing for about five minutes, and the scene that made Tang Feng feel happy appeared, not far ahead, there was a lake shore.

The closer he got to the shore, the shallower the water became, but Tang Feng didn't rush into the water because he saw that the raft was always followed by a group of fish.

It wasn't until the raft ran aground and the fish didn't follow because the water was not deep enough that Tang Feng jumped off the raft and ran to the shore in three or two steps (to be continued......