To Yang Jing's surprise, after opening the heavy watertight door, he found a circular passage with a diameter of about two meters behind it. The passage was made of special steel and was four or five meters long. On the opposite side of the passage, there was also a circular watertight door.
As soon as he saw the structure, Yang Jing immediately realized what this circular passage and the two watertight doors on the passage were used for.
More than half of this base is located below sea level. Before the base was built, it was a natural cave formed by a volcanic eruption.
Because there is no other place in the cave that connects to the outside world, sufficient air pressure is formed in the upper part of the cave to prevent sea water from surging up from the bottom of the cave.
It's just that this cave was probably discovered accidentally by Ōnishi Takijiro's men. Because it was extremely hidden, Ōnishi Takijiro decided to convert this natural cave into a secret underwater base.
But the only way to enter and exit the base is to go underwater, right? After all, the steel gate is for submarines to enter and exit, and the water is too deep. It is impossible for the soldiers on duty in the base to enter and exit through the underwater gate. Therefore, these soldiers on duty in the base must enter and exit the base from other places. And this entrance and exit must be on the island, not on the water.
However, once a hole is opened in this originally sealed cave, the air inside the cave will inevitably be expelled by sea water, and then the sea water inside the cave will be the same as the sea level outside, and this base will become useless.
Even if Onishi Takijiro didn't understand this most basic physical principle, the engineers responsible for building this base certainly understood it. So in order to avoid this kind of situation, the engineers set up a passage similar to an airtight cabin here.
When someone enters or leaves, open one door first, let the person enter the passage, then close the first door, and then open the second door. In this way, the air in the cave will not leak out.
These two watertight doors and this circular passage serve as a transition.
Although he had not inspected the base carefully and had not seen any oxygen-generating equipment, Yang Jing was sure that there must be an oxygen generator in the base. After all, the oxygen generator had been developed by the Germans in the early 20th century. Although only the Germans and French could make industrial-grade oxygen generators before the 1930s, with the outbreak of World War II, the Japanese also learned the manufacturing process of oxygen generators from the Germans.
This base was built in the 1940s, so it is absolutely impossible for the base to lack oxygen generators. Because oxygen generators can not only produce a steady supply of oxygen for the base, but also continuously replenish the air pressure consumed by the base due to the entry and exit of personnel.
After figuring out the function of this passage and the two watertight doors, Yang Jing closed one door, then walked to the other door and opened the two adjacent doors.
Outside the door was still a cave, but there were several military barracks, which should be the Japanese barracks guarding this base.
After walking about forty meters along the road between the barracks, a slanted upward ladder appeared in sight. Looking up, the ladder extended upward for more than thirty meters and was about fifteen meters high. At the top of the ladder, there was still a round watertight door.
Obviously, this inclined ladder and the watertight door at the end of the ladder are the entrances and exits to the outside world.
Yang Jing looked back at the base he was walking towards and roughly drew a picture of the structure of the base in his mind.
This base was built based on a natural cave. The widest part is at the southernmost end of the cave, which is the slipway. The east-west width exceeds 100 meters, and the cave is also the highest there, at least 40 to 50 meters high.
Then the base continued to extend northward, becoming narrower and narrower as it went northward, and the height of the cave continued to decrease. When it was more than 200 meters away, the base became more than 40 meters wide and 15 meters high. Overall, the base was somewhat similar to a trapezoidal cube.
Yang Jing shook his arms, then grabbed the ladder and began to climb up. When he reached the watertight door at the end of the ladder, Yang Jing tried to turn the knob on the watertight door. With a sound that made one's teeth ache, the watertight door finally began to move.
When Yang Jing turned the knob to the end, the watertight door was completely opened. However, this watertight door was very heavy. Even with Yang Jing's strength, it took a lot of effort to finally push the watertight door open.
The moment the door opened, sunlight and a burst of warm air suddenly poured in from outside. After Yang Jing climbed out, he found that he was on the gentle slope on the west side of Maogesi Island near the foot of the mountain.
After getting out, I found that there was a lot of dirt and rocks scattered around the door. No wonder the door was so heavy, it turned out that the door was already covered with at least half a meter of dirt, and there were also a few rocks that rolled down from the mountain pressing on it.
If it were someone else, I'm afraid they wouldn't be able to push the door open from below.
No wonder Chris and his team had not found the entrance to the base on this island before. The door was buried under the soil, and they did not have any equipment specifically designed to detect metal. Moreover, the door was almost negligible compared to the entire West Island. How could Chris possibly find this door?
Yang Jing stood next to the door, took off his mask, took a deep breath, and then started calling Chris and the others through the radio.
After a while, Chris and his friends came out of the lagoon on a motorboat. When they saw Yang Jing standing at the foot of the mountain, they all looked surprised.
After getting off the motorboat, several bodyguards ran to Yang Jing. Chris asked curiously, "Boss, we didn't see you come out of the water. Why are you standing here?"
Kevin Martin, who was standing by, said in bewilderment, "Boss, could it be that you can use the teleportation technique from Harry Potter?"
Yang Jing pointed at the big hole beside him with a helpless smile, and then several people saw the open round watertight door.
"Boss, is this the entrance to the base?" Thomas asked in disbelief, slapping his forehead. "I went up the mountain from here yesterday, why didn't I see this door?"
Yang Jing was too lazy to explain, and just said: "This door leads to the base below. There are two entrances and exits to the base below, one in the water and one here. By the way, have George and Clark come up?"
"Not yet, but it will be soon. Sean and Mark are watching over there."
Yang Jing nodded and said, "Let's take a rest first. After George and the others come up, we'll go down from here!"
PS: I would like to bow to thank "There is a dream that cannot be realized" for the reward of 1,000 and "Book Friend" for the reward of 100.
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