The underground lake is dimly quiet.

  The underwater currents were turbulent, and Teng Qing Shan was like an aquatic life swimming in the water. His skin pores also absorbed oxygen from the surrounding water flow. At this level of physical cultivation, Teng Qing Shan had complete control over his heartbeat, blood circulation, skeletal system, and everything else, all with ease and simplicity.

  Breathing through gills, although not as quick as mouth and nose, is usually sufficient for ordinary underwater breathing.

  However, once intense fighting occurs, the body's oxygen consumption accelerates, and the speed of breathing through the pores is no longer sufficient.

  Wow wow~~

  Fish of various colors swim past Mount Tengqin in schools.

  "This underground lake is really huge. I walked in one direction for about three miles and it's all water!" Teng Qing Shan was secretly shocked, this underground lake was indeed vast, and couldn't help but exclaim at the wonder of nature, "And also, the water temperature seems to have changed, quite a bit too!"

  When he first entered the water, Tong Qing felt that his body was probably around 4 or 5 degrees in terms of water temperature.

  After swimming for three miles, Teng Qing Shan felt that the water temperature had dropped by at least ten degrees. As he swam, he found some shattered ice fragments.

  "It's only three miles apart, and the water flows are still connected, how can the temperature difference be so big?" Teng Qing Shan felt a bit incredulous. According to reason, the connected water flows should have similar heat transfer, and the temperatures should be very close. "And besides, there isn't even any ice! What a strange thing!"

  Hong Qingshan suddenly thought of ——

  Bi Huatang, also known as the colder it gets at the bottom.

  "This underground lake, under the bottomless cave, is nearly a hundred zhang deep. And that emerald pool, at the foot of the mountain, is also over a hundred and several dozen zhang deep. The two depths are the same... could it be, there's a connection between the water flows?" Teng Qing Shan couldn't help but speculate, with the same depth... and yet the underground lake has such a large difference in water temperature at different locations.

  Can't help but make Ceng Qing Shan suspect this.

  At the mere thought of the icy coldness of Bihuan Pool, Teng Qing Shan became somewhat wary. That purple light python dragon, let alone him, even a Xiantian Golden Dan strong practitioner would have to be afraid of it for three parts.

  "Wow~~"

  The sound of water echoed through the air.

  Teng Qing Shan followed the sound and looked over, roughly sixty or seventy zhang away, a black strange object resembling a fort was rapidly advancing along the bottom of the water.

  "This is..."

  Hong Qingshan grasped the lake bed with both hands, and more than half of his body sank into the muddy lake bed. He crouched at the bottom of the lake, wearing a black outfit that he had specifically changed into, which was not conspicuous in the water.

  "What kind of monster is this? A giant crab?" Teng Qing Shan stared at the moving fortress-like creature, his eyes wide with astonishment.

  Although it is slightly different from crabs, the model is indeed 80% similar, but its volume is much larger.

  It's about 25 meters in length, 15 meters in width, and about 7-8 meters in height. Such a gigantic crab-like monster, when viewed from the bottom of the water, is indeed a moving giant fortress. In terms of volume, it is dozens of times larger than the transformed Red Scale Beast!

  "Whoosh~~" Those eight long and sharp claws, laid flat like wooden paddles, slapped against the water.

  And a pair of front paws, in terms of volume alone, any one of the front paws is several times larger than the entire Red Scale Beast! Teng Qing Shan had no doubt about the killing power of that pair of front paws!

  Hong Qingshan lay at the bottom of the lake, his eyes narrowed: "This group of hybrids on Qinghu Island, what are they doing searching for the underwater palace? What is this amazing place under the lake? How can it be like a savage land and give birth to such terrifying monsters! This monster has never been recorded in any book! However, in terms of strength, it must be even more terrifying than that Red Scaled Beast!"

  The book mainly records the strange beasts on land.

  Aquatic monsters, just some frequently appearing dragons and pythons, but some deep-sea monsters or some mutated monsters are not found in books.

  ……

  Swam about ten miles underwater, and the water temperature got lower and lower!

  And on this over ten-mile journey, Teng Qing Shan discovered two aquatic demonic beasts. Apart from the gigantic beast that resembled a moving fort of crabs, the second demonic beast was an entirely emerald-green toad. Its body wasn't large, probably only about one zhang in length. However, as it swam at the bottom of the water, all the surrounding fish kept their distance.

  The first giant crab beast, Teng Qing Shan didn't recognize it.

  But this strange beast, Teng Qing Mountain had seen it in books - 'Bixian Chanchan'! There is also such a monster in the wilderness.

  Bì Líng Chán, infamous for its venom! The venom it spits out can easily kill even a strong innate Golden Elixir cultivator. Of course... an innate strong cultivator wouldn't be foolish enough to swallow this venom. However, this venom also has corrosive properties. Even some divine artifacts and sharp weapons will be corroded into a big hole.

  If it were a human body, it would be unbearable from this corrosion.

  Of course, apart from the venom, the Green Spirit Toad also has an astonishing jumping speed. Apart from its poisonous and corrosive abilities, as well as its jumping ability, the Green Spirit Toad doesn't have any other special features. If a skilled person can get close to the Green Spirit Toad, they can kill it with one sword strike through its skull. Kill the Green Spirit Toad! Of course, before dying, the Green Spirit Toad still has one last trick...

  The whole body is densely covered with poisonous tumors, which can burst out a large amount of toxic liquid in an instant and spread it all around.

  "What kind of lake is this?" Teng Qing Shan felt more and more that this place was not ordinary!

  "Boom!"

  "Roar~~~~"

  A low rumbling sound, and a roar of anger came faintly from afar.

  "Hmm?" Teng Qing Shan suddenly looked into the distance, "The sound should be very far away, but I can still hear it. The battle is intense! It's likely to be people from Qing Hu Island!" Teng Qing Shan no longer hesitated and quickly swam quietly towards the rumbling place at the bottom of the lake, swimming a full three miles away.

  Three miles away, causing the water temperature to drop another level.

  Only saw in the distance a few eye-catching 'lanterns' floating in the water, surrounding and killing a black and yellow striped long snake. The big snake was over three feet long, but its body was strangely flat, like a knife!

  "The people of Qinghu Island!" Teng Qingshan instantly recognized that the thirteen 'lanterns' were actually the thirteen strongmen of Qinghu Island!

  Congenital strongmen, although their congenital true yuan is powerful, but their physical body is simple, and it's estimated that they can lift two or three thousand catties at most. So... their internal organs are quite ordinary, although they can hold their breath for a while, if they want to stay underwater for a long time, they must first use their congenital true yuan to create an air mask and store air for breathing.

  So...

  Thirteen congenital strongmen, each with a congenital true yuan energy shield, some red, some green, some gray, and some black... became thirteen 'lanterns' at the bottom of the water. With the color halo brought by the congenital true yuan, it can barely illuminate the surroundings.

  Of course, this is just the innate true yuan and not real fire, plus it's at the bottom of the water, so the range of illumination is not large.

  That fiery red innate true yuan glow also illuminated an area of about 40-50 feet in diameter.

  Grey and black congenital true yuan can hardly illuminate their surroundings.

  "With the air mask on, the light produced and the intense energy fluctuations will easily attract the attention of the demon beast! If they die, it's not anyone's fault." Teng Qing Shan stared at the thirteen people and the demon beast who were fighting, "If they had encountered a 'Iron Wire Knife Snake', unfortunately, this Iron Wire Knife Snake is non-venomous, otherwise there would definitely be someone among the thirteen who would have died!"

  Iron wire knife snake, fast speed, flat body, at first glance, the whole big snake is like a giant knife.

  His entire body was as hard and sharp as a divine sword, not easy to provoke! The only weakness was his eyes! And at this time, one of the iron wire knife snake's eyes had already gone blind. It was clear that facing thirteen congenital strongmen, the iron wire knife snake was at a disadvantage.

  "Roar!!"

  Rumbles of anger also came from other places.

  "Let's go! Don't get entangled with this iron wire snake!" shouted Gu Yong, who had a pale green light shield on his body and wore a golden yellow long gown.

  Whoosh! Whoosh! Whoosh!

  In an instant, a certain Innate strongman quickly escaped, while Gu Yong and Zhao Dan Chen and several other Innate Golden Elixirs brought up the rear. The iron wire knife snake let out a shrill cry, then with a flick of its tail, it also escaped.

  "Hmph." Teng Qing Shan immediately followed the thirteen congenital strong practitioners of Qing Hu Island.

  No energy fluctuations!

  The body's surface has no congenital true yuan energy enveloping it!

  In an absolutely dark environment, the two sides were at least thirty zhang apart, and the people of Qinghu Island couldn't discover the Tongqing Mountain behind.

  " Iron Wire Blade Snake!" The purple-robed woman said reluctantly, "A fully matured iron wire blade snake, its sectioned soft bones can forge divine weapons. It can also make flexible whip-like instruments. Those iron scales are even more formidable than the pre-heavenly golden elixir, and almost killed this iron wire blade snake!"

  The monster is dangerous, but also an opportunity!

  "Sister, this underground lake is too dangerous. Although the Iron Line Knife Snake is a treasure, its roar has obviously attracted the attention of other monsters!"

  "We've been exploring the bottom of this lake for a whole night, and so far, we've found three demon beasts that can rival the power of the Primordial Golden Elixir. Including this 'Iron Wire Knife Snake', there are three heads! Besides these three, there's an even more terrifying one..." The handsome young man, Zhao Dan Chen, said in a low tone, "In the coldest part of the edge, that dragon is absolutely a 'Purple Light Dragon'! If we were to fight it, even if we could kill it, I'm afraid we'd still suffer heavy casualties!"

  ……

  Thirteen people talking, their voices won't be too soft.

  Even thirty zhang away, one can hear clearly with Ting Qing Mountain's hearing.

  "Zigong Longwang?" Teng Qing Shan furrowed his brow. "Have they found the Zigong Longwang?" Teng Qing Shan continued to listen.

  ……

  "This underground lake, one end is extremely cold, and the other end... should be extremely hot. In the extremely cold area, there are purple glow dragons. I estimate that in the extremely hot area, there is also a fierce demon beast." The handsome young man 'Zhao Dan Chen' spoke up, "In this underground lake, there are many demon beasts, everyone be careful, don't disperse! Wan Lao previously was injured by a demon beast that didn't even reach the Xiantian stage. In this lake bottom... those aquatic demon beasts have the upper hand over us."

  "But everyone should be careful, don't force the demon beasts to join hands, if that happens, it will be bad." Zhao Dan Chen said worriedly.

  The more powerful the demon beast, the higher its intelligence. Those that can fight against the congenital golden elixir are not one bit inferior to humans in terms of wisdom. If they are forced into a desperate situation and join hands... it's very likely.

  All other congenital strongmen nodded in agreement.

  Gu Yong said, "This underground lake, the west side has been searched, the south side has also been searched, but the large area to the north has not been searched yet. Everyone should search carefully and see if there is a Yu Huang palace over there."

  At once, thirteen congenital strongmen went northward in a mighty manner.

  "Underground lake? Yu Huang's palace?" Teng Qing Shan trailed behind, shocked.

  He finally knew what he was looking for on Qinghu Island!

  "No wonder this underground lake can give birth to so many monsters." As soon as the matter is linked to 'Yu Huang', nothing is impossible. Teng Qing Shan immediately moved quietly, following those thirteen pre-heavenly strong men, and the thirteen 'lanterns' in the dark water didn't worry about losing them at all.

  （）