Finally calmed He Wenwen, who was clamoring to take a bath, and at dusk, Du Lin and He Wenwen came to the mouth of the underground dark river early, and measured the height of the underground dark river from the ground with a climbing rope, which was about fifteen meters.

Durin took off his pants and shirt, put on only a pair of boxers, and stood outside the estuary doing warm-up exercises, he planned to go down this trip, in addition to figuring out where the bats came from, but also to learn about the water temperature and flow rate of the underground river, and prepare for the next step of finding the bat's nest.

He Wenwen looked at Du Lin's wonderful muscle lines, mermaid line, eight-pack abs...... The little face is a little blushing, twenty-seven years old, although she has long passed the age of being fascinated by Xiao Xianrou, and her boyfriend has also talked about two, but such a close observation of the body of the opposite sex is really the first time that a big girl has been on a sedan chair.

Coupled with the effect of the blood effect, she has a better and better impression of Du Lin, and Du Lin also felt her fiery eyes, and quickly turned his back to prevent her from looking at it again.

As soon as he turned around, Du Lin felt a small hand as soft as a bone touch his back, Du Lin hurriedly turned around, grabbed He Wenwen's hand, and met her slightly confused eyes.

He Wenwen touched Du Lin's broad chest muscles with her other hand, and Du Lin had to grab her other hand as well.

"Who are you?" Du Lin suspected that the stinky ghost had come to He Wenwen again.

"I'm Wenwen, what's wrong, fifth brother?" Although He Wenwen's voice was a little small because of shyness, her tone was not as charming as after being ghosted, which showed that it was He Wenwen herself.

"Nothing, don't touch it. ”

"But, fifth brother, your figure is really good, I can't help but want to touch it. He Wenwen doesn't know what's wrong with her, although she is usually a little arrogant and informal, but she is by no means a rotten girl, why do you want to touch her fifth brother's body as soon as she sees it?

"I'm your brother. ”

"What's wrong with my brother, can't you touch it? I didn't do anything else, besides, it's not my own brother......" He Wenwen couldn't believe that this was what she said, why, why did she have this thought?

"Female donor, please respect yourself. Durin made a joke, trying to break the current atmosphere of awkwardness and ambiguity.

"Hmph, if you don't let you touch it, you won't touch it. He Wenwen pulled back her hand vigorously, pretended to turn around, and then took advantage of Du Lin's unpreparedness, and touched Du Lin's chest again, and then put it next to her nose and sniffed, "You stink, you stink!"

Du Lin smiled bitterly, the woman really holds a grudge, she is still thinking about the things that she said before she stinks.

Dühring tied the rope to a large tree near the mouth of the river, which was thick enough for a man to hug and could withstand Doolin's weight.

Durin tied the rope around his waist and descended little by little from the cave at the mouth of the river. The cave was more than two meters in diameter, enough for Durin to easily enter.

As soon as he entered the cave, Du Lin realized what it meant to be two heavens of ice and fire.

Outside the cave, because the air circulation in the sinkhole is not smooth, after the air is heated by the sun, the temperature may be as high as nearly 40 degrees, and this heat, the temperature will not drop until the second half of the night, and it is just dusk, and the sinkhole is stuffy and hot.

And in this cave connected to the underground dark river, it can be said to be extremely cool, Du Lin estimates that it is about 20 degrees at most, Du Lin has just warmed up and sweated a little, and now he is excited by this cool air, and suddenly feels that every pore is full of joy.

Du Lin firmly grasped the rope with one hand, and with the other hand, he picked up the flashlight tied to the climbing rope and shone it around, in fact, he didn't see it without a flashlight, but there was He Wenwen looking at it, and he had to pretend to be a little bit.

The course of this underground river is about 10 meters wide, and it is flanked by smooth stone walls that glow with phosphorescence in the light of a flashlight.

In some places, the root system of the tree can be seen, for example, the roots of the trees closest to him should be extended from the tree where he tied the rope.

Looking down, even if Durin has "super five senses" and can see at night, it has at least some glimmer of light to assist, such as starlight and moonlight, but it is so dark that even Dorin's ability has lost its effect.

Here Durin could already clearly hear the sound of the river flowing, but could not hear the direction of the water, he loosened the rope and began to descend deeply, until it was about ten meters, he could already shine a flashlight on the water, and after seeing the direction of the upstream and downstream, Durin used a compass to determine that the river was flowing from west to east.

Putting away the compass, he continued to descend until his toes touched the water, and unsurprisingly, the underground river water was bitterly cold, and Durin felt the cold like ice water just half of his foot in the water, which stimulated him several times.

Durin threw a section of rope prepared in advance on the surface of the water, and calculated the speed of the underground river to be about 2 to 3 meters per second through the speed of the rope floating.

Looking at his watch, it was almost time, and it was around this time yesterday that Durin saw those bats flying out of the mouth of the cave to feed.

Durin hurriedly climbed up, and sure enough, when he was about to reach the entrance of the cave, he heard a sound of "fluttering" flapping his wings from the upstream direction.