The bones of the forest are piled up, and the ghosts of the cave of death are lost.

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Reef Island, a biological island with the main structure composed of dead reef wreckage, has become a mooring point for living reefs and an important ecosystem for the life of a large number of marine organisms.

After several days of sleepless sleep, the mother whale found a more comfortable place to get some sleep. In the past, every time the whales slept, Xinglan, who didn't need to sleep, would wander around or close her eyes to sort out her memory, but this time, it seemed that she was not the only one who couldn't sleep.

"Resting ......"

In the vicinity of this reef where a large number of creatures gather, the whale is very excited, and the most obvious manifestation is ...... It had insomnia.

"So, are you really a fool too?" Xing Lan watched weakly as the over-energetic little whale in front of her rampage with a huge body of more than ten meters, scaring groups of small animals into scattering and fleeing, "Huh? Why do I say 'also'? ”

Bang!

With a muffled sound, the overexerted small whale crashed directly into the reef island, but fortunately, the strength of the outer reef was still okay, and it did not fall apart directly, but it still dropped a large piece of debris, and the sucker fish inside was so frightened that it hid in the depths and shivered.

Well, because the reef is made up of countless tiny creatures made of calcium, even if more than half of it is crushed, it will not die, but the debris that falls on the ground may develop into a new reef again...... Of course, until they have a full internal piping pressure system again, they won't be able to float freely in the sea using the water spray function.

"Don't you know your head hurts?" Looking at the little whale with some red and swollen head, the corner of Xinglan's mouth twitched, and she touched its head comfortingly, pointing to the destroyed reef, "Did you get into trouble this time?" You see you knocking a big hole out...... Huh? Big hole? ”

This time, Xinglan was stunned, and the silver-haired girl in a black diving suit floated in the seawater, stunned as the reef shattered and revealed a deep hole inside......

What kind of trouble is this kind of secret treasure like unfolding, hey!

Shaking her head, Xinglan decisively interrupted her unrealistic delusions, Hidden treasure? In this day and age, such caves are more likely to be the place where the excrement of certain creatures is dumped than the treasures of intelligent creatures......

Well, thinking of this, Xinglan instinctively stepped back a few meters, looking vigilantly at the calm deep cave entrance, joking, if that really happened...... Soak in the sea water together, you can't even touch it!

Well, jokes aside, as the so-called curiosity can kill cats, although she knows that there is nothing good in it, Xinglan still can't resist the desire to go in and explore. Hope...... Oh, she wasn't here for any treasure, but mainly to see if there would be any strange creatures in the caves of this reef that were different from the outside world.

The entrance to the cave is not small, about three meters in diameter, but for the small whale that is now more than ten meters long, there is really not enough space to flick its tail.

"Ah, it seems that you can only stay outside~" Xinglan patted the little whale that looked a little listless, and there seemed to be a faint smile in the empty mechanical eyes, "Then I'll go in by myself!" ”

"Breath ......" The little whale whimpered aggrievedly, but there was no choice but to watch Xinglan swim into this cave that should be very interesting in its eyes, and flicked its tail sullenly, and the little whale continued its great cause of bullying ordinary small fish......

……

These underwater caves are called blue holes because they give a deep blue color when illuminated by light.

Although the cave on the reef island is not a natural cave made of rock, but a biological debris, Xinglan feels that this cave is still a well-deserved blue hole.

"Optics on." The girl spoke in the water, her voice a little dull.

The forehead and the ends of the limbs of the robot's body are equipped with light-emitting components under the skin, and at the command of the central processing unit, the artificial skin on the outside separates to the sides, and the bright light inside illuminates the cavern.

Although it is made up of biological remains, this makes the cave even more terrifying. In the silence of the water, the wreckage of Bai Sensen's reef forms the walls of a near-circular tunnel, sometimes interspersed with a few animal bones of different shapes that protrude outward, making it look full of gloom.

Of course, creatures without advanced intelligence only have things like foraging, breeding, and fighting, and they don't care about any eerie atmosphere, as for Xinglan...... As a star, can you find anything more yang than her?

Well, that's all......

"Hmph, we won't be afraid!" Xinglan pursed her lips slightly, swimming in the center of the tunnel as much as possible to avoid touching the animal bones that protruded randomly, she raised her palm to illuminate the tunnel in front of her, which still had no end in sight, "This, that's it...... Ahhh ”

Xinglan, who was in a high level of nervousness, suddenly felt something pass by her hair, it wasn't an illusion! The data from the pressure sensor clearly records this!

Xinglan turned her head sharply, the luminous element on her forehead glowing brightly, but ...... Nothing.

"It can't be!" Xinglan looked in shock at the empty tunnel of bones, which contained nothing but seawater.

"Cai, I am not afraid! Infrared scanning! Xinglan fully turned on the infrared detection function, "Hmph, even the most powerful protective color is ...... Eh, how is that possible? ”

In the picture of the infrared detector, the white bone cave is still empty, and there is no heat display of life activity except for the water flow, but what has just wiped the hair is definitely not the water flow, and it cannot be the skeleton of the protruding remains on the cave walls on both sides, it is a soft, biological tissue-like thing!

"How so? If it's a living creature, there will definitely be a body temperature display, but there will be no body temperature...... Woo woo......" Xing Lan shuddered inwardly, "Death...... Dead? From the current point of view, the biological evolution of Lanxing has always been strange, can it be said that ...... I mean, maybe, it won't really evolve a ghost or something, right? ”

No, calm down! Calm down! If you can't detect it by infrared, it may be a cold-blooded animal, even if it's really a ghost or something, there's nothing to be afraid of...... Probably?

"Anyway, it couldn't have been an illusion just now!" Muttering as if hypnotized, Xinglan reconfirmed the data log and looked around nervously.

In other words, as an existence that can easily destroy this planet with a super nuclear explosion, what are you afraid of, girl!

"Fruit...... Sure enough, it should be a little more hidden......" Xinglan adjusted the pigment program, and watched the silver hair slowly turn into a thick ink-like color, completely blending into the darkness, before she breathed a sigh of relief, "Protective color or something...... We have it too! ”

Hawkers, a certain star seems to have forgotten that there is such a bright light on her forehead and limbs, will it really be useful to protect the color or something?

……

After staying in place for a while, Xinglan, who really didn't find any clues, gritted her teeth and continued to swim towards the inside of the cave.

It's a pity that, after all, it is a robot built by simulated humans, even if Xinglan wants to show the camera behind it for observation without dead ends, but due to hardware limitations, he still has to give up this plan.

Of course, if Xinglan mobilized some signals around, not to mention the blind spot vision, it would be more than enough to scan the entire reef island in an instant, but for the fun of exploration, she still gritted her teeth and insisted on the same.

In fact, this kind of mentality is like many people shouting that horror movies are terrible, so scary, but they always can't help but secretly open and watch them in the middle of the night......

The rumbling sound of the water gradually became louder, and even though the reef that made up the inner reef was dead and there was no breath of life in it, the interior of the reef was still filled with a large and complex pipeline system. Seawater from the outside world is constantly flowing in these pipes, converging or diverging, forming a wonderful circulatory system.

The interior of the entire reef is like an ordinary reef magnified countless times, and the echoes of the current are constantly reflected and superimposed, and Xinglan can't tell the distance of their origin based on the frequency of the sound...... The chaotic wave interference makes it quite difficult to locate by relying on the Doppler effect.

After swimming hundreds of meters into the inside of the pipe again, Xinglan saw the end of the passage.

Not the ocean of the outside world...... Xinglan turned the light source and surveyed the massive underwater cavern, the edge of which was dotted with countless tunnel openings similar to the pipes she had come from.

"Something is wrong...... Xinglan frowned, "This passage is not particularly hidden, nor is it particularly deep, but I haven't seen any life since I entered the cave, and even such a large cave here has no signs of life at all......"

The absence of living life does not mean that there are no traces of life, and the caves here are still made of pale biological remains, which look very eerie in the light of the white light.

Woowoo......

It seems that due to the complicated pipes, the rumbling sound of the seawater crashing here becomes sharp, as if it is wailing bitterly. There was a terrible echo of this kind in all directions, and there was no source of sound in the slightest.

What kind of horror movie is this kind of prehistoric era! Xinglan had the urge to flip the table, she didn't believe that these sea creatures could have a resentful spirit because of the strong resentment of being eaten!

As for the mysterious existence hidden in the planet...... It's weird! I put this planet together by myself!

After complaining heartily, Xinglan felt much better, and she swam as she carefully examined the bottom of the cave.

Not to mention, it really made her discover something strange.

They were mutilated carapaces that glowed faintly in the dark, but Xinglan quickly recognized their identities.

Glow sea scorpions, a type of scorpion found when tracking sea giants before, live on the seabed, with an average length of about one and a half meters, and a highly venomous tail spine on their tail. Because their carapaces glow white in the dark, Xinglan named them Glow Sea Scorpions.

"Judging from the fact that the carapace can still glow, it should not have been long after death, so they are obviously not here when the cave was formed, but creatures who have only been in the cave for a long time." Xinglan posed as a forensic doctor, but unconsciously bit her fingers to sell cuteness, "This means that there are creatures here that have come in, but they have died inside...... Eh, this is ...... Bite marks? ”

Something is wrong, the bite marks on the carapace indicate that these scorpions have been eaten! There is definitely something wrong with this cave!

Faintly sensing a hint of something wrong, Xinglan turned around and prepared to evacuate temporarily, but when she returned according to the route in the memory bank......

"This ...... Impossible, right? How so? ”

On the walls of the cave made of pale bones, the entrance of the tunnel where it had been entered had disappeared without a trace......

(Ming, tomorrow is the big exam!) I'm so nervous, I'm so nervous...... Everybody help us pray, well, I want to gather the power of the will! But don't worry, it won't be broken, because ...... There is a manuscript~)