Thermite underwater cutting is indeed the fastest underwater cutting method, but it is also the most violent cutting method.

This cutting method is usually used for cutting super thick steel plates. Because this method is simple and violent, don't expect to be able to cut out regular patterns using this cutting method.

For example, if plasma arc cutting or arc-oxygen/steel pipe cutting are rigorous fine brushwork, then this thermite cutting method is impressionist painting...

However, this method is the most suitable for breaking open the steel plate of the underwater gate of the secret base. Yang Jing does not ask to cut the gate into any regular pattern, as long as the steel plate of the gate can be broken and people can get in, it doesn't matter whether the hole is round or square.

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

The thickness of this steel door exceeded Yang Jing's estimation. The 120 mm thick steel plate was enough to serve as the frontal armor of a medium tank in World War II, but it was used here as a gate, and it was a door with such a large area. This was enough to prove how much importance Onishi Takijiro, who built this base at that time, attached to this base.

But as Yang Jing expected, the moment the gate was broken open, the seawater outside the gate did not rush into the gate. Obviously, there was also seawater inside the gate.

When Onishi Takijiro built this secret base, it was obvious that he wanted to use submarines to transfer and transport the looted goods from various places into this base. After all, this kind of base hidden underwater is the most concealed. More than 70 years ago, it was almost impossible for anyone to find it.

Therefore, it is impossible for this kind of underwater base to completely block the water. It must be able to allow submarines to dive and surface smoothly. Therefore, there should be a large pool inside the gate to facilitate the submarine to surface and then transport the transported property out.

In this case, George Cruise naturally couldn't follow in. Because there is air in this underwater cave, the air floats on the surface, and the air pressure can resist the pressure of the seawater, so water won't flow in. The people in the movies who enter such a cave can take off their diving suits immediately, which is pure nonsense.

It's a very simple truth. Although seawater will not flow into this kind of underwater cave, the pressure of the seawater in the cave is still very high. It is as if at this depth, George Bruce is actually under a pressure of up to five atmospheres, and he has been breathing with a scuba tank. Because of the seawater pressure, the nitrogen in his body has already decomposed into his blood.

If he swam in and immediately came ashore from the cave to take off his diving suit, and was directly exposed to the same air pressure as at sea level, it would be equivalent to him instantly coming to the sea level from a depth of 50 meters under the sea. The helium in his blood would surge out of his blood due to the rapid drop in air pressure, eventually forming a large number of bubbles in his lungs, and in severe cases his lungs would directly burst!

This is called decompression sickness.

Although it is still unclear what is behind the door, for safety reasons, George Bruce would better follow the regulations and slowly float up, allowing the pressure in his body to slowly adapt to the increasing air pressure and avoid the occurrence of decompression sickness.

George waved at Yang Jing and began to float up slowly. Clark McCann was still waiting for George at a depth of about thirty meters. The two of them would slowly float up together and eventually return to the surface of the sea.

Yang Jing had energy to protect his body, so he naturally didn't worry about getting decompression sickness. So after seeing George slowly floating up, he turned on the waterproof spotlights on his head and shoulders, moved his body, and drilled into the big hole that had just melted.

The sea water quality near the Maugue Islands is quite good. When they were cutting the gate outside just now, they didn't even need to turn on the lights, because with such excellent sea water quality, the sunlight can even penetrate more than 50 meters deep sea water, allowing Yang Jing and others to see things at this depth.

But inside the door it was completely dark.

The powerful waterproof spotlights on the top of the head and shoulders can illuminate more than ten meters away even in the water. Compared to outside the gate where you can occasionally see groups of tropical fish swimming freely, after entering the gate it becomes a completely silent and dark world.

There is not even a shadow of a fish behind the gate. This is not surprising. Considering the sealing degree of the gate, the sea water behind the gate probably has not interacted with the sea water outside in the past 70 years. How could there be fish?

Not long after swimming in, Yang Jing began to float up rapidly. After floating up about thirty meters, Yang Jing felt his body lighten, and his head and upper body were already above the water.

It was still pitch dark around him, but the spotlights on his head and shoulders were no longer blocked by the sea water and could now directly shine at places thirty or forty meters away. Therefore, Yang Jing could easily see the reinforced concrete slipway seven or eight meters away from him.

The slipway is about six or seven meters above the water surface, which is just enough for the submarine to float up and the bridge to be level with the slipway, making it easier to transport cargo. On the west side of the slipway, there is a steel ladder that allows you to climb up to the slipway.

But Yang Jing did not rush to step onto the slipway. Instead, he continued to tread in the water to keep his body balanced and began to look around.

This underwater cave is obviously a huge cave formed naturally. It was probably formed by the impact of magma mixed with a large amount of gas that erupted from deep in the earth's crust during a volcanic eruption.

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