Ye Qingcheng opened his eyes and saw a small submarine like a sea boat floating slowly above the sea at the stern. The dark black body of the submarine was not conspicuous on the dark sea.

"Let's go, Qingcheng... It's my friends. They're coming." Li Chen narrowed his eyes and looked at the stern. Sure enough, he saw the submarine floating. There were two young men inside.

Ye Qingcheng nodded and walked forward with Li Chen's footsteps.

The submarine floats on the sea. It floats up and down because of the waves. Under the cover of the night, it looks like a wandering ghost.

Generally speaking, submarines are mostly used as weapons because they have the following characteristics:

It can use the water layer to cover covert activities and carry out sudden attacks on the enemy; It has greater self supporting, endurance and operational radius, and can be far away from base, and operate independently in long time and awesome marine areas and even into enemy sea areas.

It can launch missiles, torpedoes and lay mines underwater to attack sea and land targets.

However, it also has many disadvantages, such as:

The submarine has poor self-defense ability and lacks effective air observation means and air defense weapons;

Underwater communication is difficult, and it is not easy to realize two-way, timely and long-distance communication;

The detection equipment has a short operating range, limited observation range, easy to be affected by the environment, and it is difficult to master the enemy's situation;

The underwater speed of conventional power submarine is low, and the endurance of underwater high-speed navigation is very limited;

When charging, it must be in the navigation state of the vent pipe, which is easy to be exposed.

Generally speaking, up to now, in addition to being used as weapons, there are also small private submarines, such as the rich second generation marine entertainment.

Close to the railing at the stern, ye Qingcheng saw the submarine at a close distance and couldn't help being slightly surprised.

The high platform I saw originally was just a lookout platform for submarines.

The body of the boat sank into the sea, revealing only a small part. Through the faint sea, the body below is about 10 meters long.

Submarines are divided into three categories: double shell submarines, single shell submarines and half shell submarines.

The double hull hull is divided into inner shell and outer shell. The inner shell is a steel pressure hull to ensure that the submarine can bear the hydrostatic pressure corresponding to the depth when it moves underwater; The shell is a steel non pressure hull, which does not bear sea water pressure.

Between the inner shell and the outer shell are the main ballast tank and fuel tank.

The single hull submarine only has a pressure hull, and the main ballast tank is arranged in the pressure hull.

A half shell submarine is provided with partial non pressure resistant shells on both sides of the pressure hull as the main ballast tank of the submarine.

Ye Qingcheng doesn't know much about the structure of submarine. According to her intuition, it should be a single shell submarine as a private submarine.

I just looked on the deck and thought that the submarine was very close to the stern. Unexpectedly, it was really close to the stern. I found that it was at least 3-5 meters away from the lookout.

The head of the boat is about one meter from the stern.

The ship is still moving at a constant speed, and the submarine always keeps a small distance from it.

It is almost impossible to get directly from the deck to the submarine.

Not to mention that ye Qingcheng is not water-based, the sea water at night is also particularly cold.

Just then, two young men climbed up from the inside of the submarine and stood in the lookout. The sea wind was whistling and scraping their hair. Their voice was dispersed by the sea wind and was very blurred.

They gestured.

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