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  On the southern coast of Beidou Xing, at the foot of an inconspicuous small hill, a huge tent was set up. Inside the tent, ten people wearing adventure suits were gathered around a map projected on the ground.

  These ten people were Lin Fei, Kai Dan Nu and the eight hired cosmic mercenaries, a well-known interstellar excavation team in the adventure world.

  This team, although only consisting of eight people, six men and two women, each one claims to be a master among masters in exploring and excavating ancient ruins. As for their actual abilities, Lin Fei didn't know, but it's said that the cost of hiring them this time was quite high.

  Lin Fei listened to these so-called professional explanations about the preparations and precautions before entering the underground cave, feeling bored. However, Kaidan Musume was listening very seriously and occasionally took some notes.

  Then, Lin Fei wore the combat uniform prepared by Kai Yan Nü, holding an energy gun, a metal dagger, with a high-intensity lamp on his head, a rope and a high-energy food bag at his waist, and a small metal box containing medical equipment from Kai Yan Nü on his back. The box was equipped with a counter-gravity device, which was not heavy, but Lin Fei tried to move it a few times, feeling some impact on his agility.

  Lin Fei and Kai Dan Nu, along with the deputy armed forces, and eight mercenaries carrying various weapons and adventure equipment, arrived at a cave entrance at the foot of the mountain.

  It's more like a heavenly pit than a cave entrance, a circular hole with a diameter of over one meter appeared on the ground at the foot of the mountain.

  According to the introduction of the female commentator, this large sinkhole may have appeared due to a recent submarine volcanic eruption and intense underground activity. According to the preliminary exploration by a small robot, it is an extremely deep underground cave like a maze.

  However, as the small robot delved deeper, it was destroyed by an unknown object, indicating that this underground cave may have biological existence. And Kaikō is coming for the possibility of ancient creatures.

  Eight self-proclaimed professional mercenaries began setting up a pulley system around the suddenly appeared sinkhole. After the ropes were ready, two of the eight mercenaries descended into the cave first to set up lighting equipment.

  Next, Lin Fei and Kai Dan Nu followed the remaining mercenaries, one after another, through the pulley rope, into the underground cave.

  With the rope tied around his waist, Lin Fei slowly descended from the entrance of the large cave through the pulley.

  After falling for about 200 meters, it finally landed on the ground.

  At this time, the cave below has been illuminated by the lighting facilities set up by the expedition team. The scenery is very magnificent, with white cone-shaped stones dripping water downwards, small ponds, and irregular caves appearing on the surrounding stone walls, as well as unknown yellow plants in the crevices of the stones.

  After the woman with a hatchet went down into the cave, she didn't look at the scenery, which couldn't attract her. Instead, she took test tubes to collect water and plant samples from the pond, and preserved the collected plant specimens.

  Lin Fei walked around the cave and found an old hat, a tattered hat with a thick layer of dust that had been there for who knows how many years.

  "Didn't we come down first?" Lin Fei called over the opened-chest woman and the eight members of the expedition team, pointing at the broken hat.

  Of course, everyone was silent and no one answered Lin Fei.

  "Now we are just in the outer rim of the cave, next, we will go through the rock crevices to enter deeper caves for a five-day exploration." An elderly man who seemed to be the leader of the eight-person expedition team said, pointing to a huge hole like a rat hole at the bottom of the cave wall.

  Then, eight adventurers and the opener, entered this large pit one after another. Lin Fei, carrying an elliptical instrument case on his back, also began to drill into the pit. However, the pit was very narrow, and the stone walls on both sides squeezed Lin Fei's body tightly.

  "Ah!" Lin Fei was stuck in the narrow cave because his equipment was too large, and he got wedged in the crevice of the cave.

  Lin Fei tried to move, but couldn't budge forward or backward. In this narrow crevice, the person in front of him couldn't come back to rescue him. As Lin Fei struggled, the dust inside the cave was stirred up, and he felt his breathing becoming difficult. He might just get stuck here and die.

  "Back three minutes ago." Lin Fei decisively activated his ability, War God Three Minutes (Fake).

  The scene in front of him changed rapidly, and Lin Fei returned to the time before he entered the cave crevice. The female corpse in front of him was just about to crawl into the cave.

  "Wait, Kai Tian Nu, this box of experimental equipment is too big to enter the cave. Let's take one or two things we need and I'll leave the rest here. We can come back for them when we need them." Lin Fei called out to Kai Tian Nu.

  "What, you want me to put my experiment box outside? It's just laziness, not wanting to carry it. Men are unreliable, they all hate carrying things for women." Suddenly, the woman with the scar said this, and Lin Fei was taken aback.

  However, the woman herself tried to experiment with the size of the box, pushing it into the gap in the cave, and found that she couldn't push it all the way to a corner in the middle. She could only slowly retreat back out, then picked up a small leather pouch from the experimental box and hung it on her waist before re-entering the gap in the cave.

  "Can she be considered a woman? More like a female ghost." Lin Fei muttered to himself as he looked at the black-haired woman with her chest open, entering the crevice of the cave. Afterwards, Lin Fei also quickly drilled into the crevice of the cave.

  Ten people gathered in another small cave. This time, there was only one large pool in the small cave.

  "The previous probe robots have detected that this pond is connected to another vast and complex cave, which can be reached by swimming for about a cosmic hour. I've prepared underwater breathing masks and propulsion devices for you all. This underground water area is very wide and has several forks, so be careful." The old team leader said, taking out eight breathing masks the size of a mask and four small underwater propulsion devices.

  These four small thrusters were no larger than a closed umbrella before they started, but once they did, they actually grew longer and bigger, with a huge spiral appearing in front and two handles appearing at the back that could be held by two people.

  This time it was two members of the expedition team who first descended into the water, started the propulsion and lighting equipment, moved forward, and pulled a rope down.

  After a space-time, news came from ahead that they had arrived safely.

  Then, Lin Fei and Kai Tuan Nu formed a group, holding the handles on both sides of the propeller, their bodies tightly attached to each other, and through the already pulled rope on the gear, they started the propeller and moved quickly.

  Through the oxygen supply of the breathing mask, Lin Fei felt a pungent smell, which was likely that the expedition team had not cleaned the breathing mask well after their last use, or they had never cleaned it since they started using it, causing dust and impurities to accumulate on the oxygen filter device.

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