Underwater cutting of aluminum thermal agent is indeed the fastest underwater cutting method, but it is also the most violent cutting method.

This cutting method is usually used for cutting ultra-thick steel plates. Because this method is simple and violent, so don't expect that this cutting method can cut out any regular graphics.

For example, if plasma arc cutting or arc-oxygen/steel pipe cutting method is a rigorous fine brushwork, then this aluminum thermal agent cutting method is an Impressionist painting...

However, using this method to break the underwater door steel plate of the secret base is the most suitable. Yang Jing did not ask for any regular pattern to cut the door. As long as the steel plate of the door could be broken, it would be OK. As for whether the hole was broken or the hole was round or square, it didn't matter.

With the cooperation of Yang Jing, George Cruise melted the 120 mm thick steel door into a large hole with a diameter of one and a half meters in less than half an hour.

The thickness of this steel door exceeded Yang Jing's estimate. The 120 mm thick steel plate was enough to serve as the front armor of the World War II medium-sized tanks, but it was used here as a gate. And it was a door of such a large area, which was enough to witness the importance of Takijiro Oshiki who built the base at that time.

But Yang Jing estimated that the moment the gate was broken, the sea water outside the gate did not pour into the gate. Obviously, the sea water inside the gate was also also sea water.

When Takijiro Oshiki built this secret base, it was obvious that he had to use a submarine to transfer and transport the property plundered from various places into this base. After all, this kind of base hidden underwater is the most hidden, and more than 70 years ago, it was almost impossible for anyone to discover it.

Therefore, this kind of underwater base cannot completely block the water. It must allow the submarine to penetrate and float smoothly. Therefore, there should be a large pool inside the gate to facilitate the submarine to float and then transport the transported property out.

In this case, George Cruise naturally cannot enter. Because there is air in this underwater cave, the air floats on it, and the air pressure can withstand the pressure of sea water, so the water will not be poured in. Those who perform in movies can immediately take off their diving suits when entering such a cave, which is purely talking nonsense.

It's very simple. Although the sea water cannot be poured into this kind of undersea cave, the pressure of the sea water in the cave is still very high. It's like at this depth that George Bruce is actually under pressure of up to five atmospheres, and he has been breathing with scuba lungs. Because of the pressure of sea water, the nitrogen in his body had long been decomposed into his blood.

If he swam in and immediately went ashore from the cave to take off his diving suit and was directly exposed to the same air pressure as the sea level, it would be equivalent to him coming to the sea level from the bottom of the sea 50 meters deep. The helium in his blood would gush out of the blood due to the rapid decrease in air pressure, and eventually a large number of bubbles formed in his lungs. In severe cases, it would directly break his lungs!

This is called decompression disease.

Although it is not clear what the door looks like, for safety reasons, George Bruce should be honest and slowly floating up according to the regulations, so that the pressure in his body can slowly adapt to the increasingly smaller air pressure, and avoid the occurrence of decompression diseases.

George waved his hand at Yang Jing and began to float slowly. Clark McCann was still waiting for George at a depth of about thirty meters. They would slowly float together and finally return to the sea.

Yang Jing has energy to protect his body, so he naturally would not worry that he would get decompression disease. So after seeing George slowly float up, he twisted the waterproof spotlights on his head and shoulders, and as soon as he moved his body, he drilled into the big hole that had just melted open.

The sea water near the Maoge Islands is of great quality. When cutting the door outside just now, I didn’t even have to turn on the lights because under this excellent sea water quality, the sunlight can even pass through more than 50 meters of sea water, allowing Yang Jing and the others to see things at this depth.

But the inside of the door was completely dark.

The powerful waterproof spotlights above the head and shoulders can shine more than ten meters away even in the water. Compared to the outside of the gate, you can see groups of tropical fish swimming freely and freely outside the gate. After entering the gate, it completely becomes a quiet and dark world.

It is not surprising that even a fish can't be seen behind the door. With the sealing degree of this door, the sea water behind the door may not communicate with the sea water outside for more than 70 years, so how could there be fish?

Not long after swimming in, Yang Jing began to float up quickly. After floating about 30 meters, Yang Jing felt that his body lightened, and his head and upper body had already exposed the water.

The surroundings were still unable to see their fingers, but the spotlights on the head and shoulders were not blocked by sea water, and now they could directly shine thirty or forty meters away. Therefore, Yang Jing could easily see the reinforced concrete platform seven or eight meters away from him.

The boat platform is about six or seven meters away from the water surface. This height just allows the submarine to float up, and the position of the bridge is level with the boat platform, which is convenient for transporting goods. On the west side of the boat platform, there is a ladder made of steel bars that can climb onto the boat platform.

But Yang Jing did not rush to board the boat, but continued to step on the water to keep his body balanced and began to look around.

This undersea cave is obviously a huge naturally formed cave. It should have been caused by the impact of a large amount of gas when the volcano erupted.

This situation is common in volcanoes, because when a volcano erupts, huge heat will melt the rocks in the mountain. When a large amount of gas exists, huge holes will easily form in the soft mountain. If the impact force of the gas is not enough to break through the magma, when the magma cools down to form rocks, these gases will be left in the mountain forever, forming such strange caves.

This huge cave in front of me was obviously formed in this way, after all, it was the huge crater just a few meters away.

The top of the cave is thirty meters away from the water surface. As for the length and width, Yang Jing cannot see the end. However, in the middle of World War II, the major submarines of the Japanese Navy were about 100 meters long. This large pool that can be used for submarines to drive in was at least more than 100 meters long.

The width of this large pool is about fifteen meters, which is similar to the width of the gate. During World War II, the widest submarine of the Japanese army was the first-class submarine patrol submarine built by the U142 submarine technology introduced by the Germans. This submarine with a width of 1,970 tons (on water)/2,791 tons (underwater) has a width of 9.22 meters, making it the widest submarine of all Japanese army models.

Therefore, the gate and pool with a width of fifteen meters were enough for Japan's widest submarine to enter safely.
Chapter completed!