Happy Tycoon

To Yang Jing's surprise, after opening the heavy watertight door, behind the door was a circular passage with a diameter of about two meters, and the passage was made of special steel, which was four or five meters long. On the opposite side of the passage, there is also a circular watertight door.

Looking at this structure, Yang Jing immediately realized what the circular passage and the watertight doors at both ends of the passage were for.

More than half of the base is below sea level. Before the base was established, it was a natural cave formed by a volcanic eruption.

Because the cave has no other place to communicate with the outside world, enough air pressure is created in the upper half of the cave to keep the sea water from rushing up from below the cave.

It's just that this cave should have been accidentally discovered by Jiro Onishi's men back then. Because it was extremely hidden, Jiro Onishi decided to convert this natural cave into a secret underwater base.

But you can't just go underwater when entering and leaving the base, right? After all, the steel gate is for submarines to enter and exit, and the water depth is too deep. It is impossible for soldiers who are usually on duty in the base to enter and exit through the underwater gate. Therefore, these soldiers on duty in the base must enter and leave the base from other places. And this import and export must be on the island, not in the water.

But once an opening is made to this originally sealed cave, the air in the cave will inevitably be expelled by the sea water, and then the sea water in the cave will be at the same level as the sea outside, and this base will lose its function.

Even if Onishi Takijiro didn't understand this most basic physical principle, the engineer in charge of building the base must understand it. So in order to avoid this from happening, those engineers set up such a passage similar to an airtight cabin here.

When someone comes in and out, first open a door, the person enters the passage, then close the first door, and then open the second door. This way, the air inside the cave won't leak out.

These two watertight doors and this circular passage play such a transitional role.

And although he didn't inspect the base carefully just now, and didn't see the relevant oxygen generators, Yang Jing is sure that there are definitely oxygen generators in the base. After all, oxygen generators have been banned as early as the beginning of last century. The Germans worked it out. Although only Germans and French were able to make industrial-grade oxygen concentrators in the world before the 1930s, with the outbreak of World War II, the Japanese also learned the production process of oxygen concentrators from the Germans early on.

And this base was established in the 1940s, so it is absolutely impossible to lack oxygen generators in the base. Because the oxygen generator can not only generate a steady stream 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 those two watertight doors, Yang Jing closed the first door, then walked to another door and opened the second door.

There are still natural caves outside the gate, but there are several military barracks, which should be the Japanese barracks guarding the base.

After walking along the road between the barracks for about 40 meters, a slanting upward ladder appeared in sight. Looking up, this slanting ladder extended upwards for more than 30 meters, with a height of almost 100 meters. About fifteen meters away, at the top of the inclined ladder, there is still a round watertight door.

Obviously, this inclined ladder and the watertight door at the end of the inclined ladder are the entrances to the outside world.

Yang Jing looked back at the base that came over, and roughly drew the structure of the base in his mind.

This base was built on the back of a natural cave, and the widest part is on the southernmost side of the cave, that is, on the side of the slipway. Forty or fifty meters high.

Then the base extends all the way to the north, and the width becomes narrower as it goes north, and the height of the cave is also decreasing. Until it was more than 200 meters away, the base became more than 40 meters wide and 15 meters high. Overall, the base is somewhat similar to a trapezoidal cube.

Yang Jing shook his arm, then grabbed the ladder and began to climb up. When he came to the watertight door at the end of the ladder, Yang Jing tried to twist the knob on the watertight door. Accompanied by a tooth-piercing sound, the watertight door finally started to move.

When Yang Jing turned the knob to the end, the watertight door was completely opened, but the 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 was opened, sunlight came in from the outside along with a burst of warm air. Yang Jing climbed out and took a look, only to find that he was on the gentle slope on the west side of Maogexi Island, close to the foot of the mountain.

After drilling out, it was discovered that there was a lot of soil and a few rocks scattered beside the door. No wonder this door is so heavy. It turns out that the top of this door has long been covered with at least half a meter thick soil, and several rocks rolled down from the mountain are also pressed on it.

If it were another person, I'm afraid it would be impossible to open the door from below.

No wonder Chris and the others did not find the entrance to the base on this island before. This door was buried under the soil, and they didn't have special instruments for detecting metal, and this door was so small that it was almost negligible compared to the entire West Island, how could Chris find this door? Door?

Yang Jing stood next to this door, took off his mask and took a deep breath before calling Chris and the others through the radio.

After a while, Chris and the others came out of the lagoon in a motorboat, and saw Yang Jing standing at the foot of the mountain with strange faces.

After getting off the motorboat, several bodyguards trotted up to Yang Jing, and Chris asked strangely: Boss, none of us saw you coming out of the water, why are you standing here?

Kevin Martin on the side said with a confused face: Boss, could it be that you can use the kind of transposition in Harry Potter?

Yang Jing pointed to the big hole beside him, dumbfounded, and then several people saw the open round watertight door.

Boss, is this the entrance to the base? Thomas patted his forehead and asked incredulously, I went up the mountain from here yesterday, why didn't I see this door?

Yang Jing didn't bother to explain, just said: This door leads to the base below. There are two entrances and exits in the base below, one in the water and one here. By the way, are George and Clark coming up yet?

Not yet, but soon, Sean and Mark are watching over there.

Yang Jing nodded and said, Take a break first, we will go down here after George and the others come up!

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