The invention of the submarine is based on the ancient Archimedes principle, so compared with surface ships, submarines have an additional necessary device, that is, the water tank, by filling the tank with water, increasing the gravity of the submarine, it sinks.

And if you want to surface the sea, you need to use the compressed air carried by the submarine to discharge the seawater, just like the swim bladder, in the process of the North American Revolutionary War, the submarine was first invented, and what made the submarine shine was still the two world wars of World War I and World War II.

Of course, the protagonist is not an island submarine.

Now, the I-74 submarine has been damaged by anti-submarine depth bombs, and it must quickly rise to the surface, otherwise it will never be able to surface.

Nervous, he ordered the bow ballast tank to be emptied after learning that there was already a leak in the tail.

It's not all the tanks that are emptied, which of course is exquisite.

When the submarine is fully in the seawater, it can rely on the elevator to operate the various actions of the submarine, which is very similar to an airplane, and if you want to float the submarine, you need to let the bow of the boat go up.

How can we quickly get a submarine in this state? Emptying the bow of the boat, of course!

Compressed air poured into the ballast tank at the bow of the boat, draining the seawater from the bow, and the bow immediately lost weight, while the tail was poured in by the seawater, so that the submarine was like a seesaw, naturally cocked!

The bow of the boat is rising rapidly, and every submariner is tightly holding on to the handrail next to it, which is the most crazy and exciting kind of submarine operation, emergency floating!

(In later generations, Lao Mei often did this, and as a result, he often tragically collided with ships on the sea, causing several major accidents.) ）

The I-74 had to do this, because it was already flooded, and if it didn't get up quickly, it might never get up!

The hull continued to rise, and soon, the angle exceeded thirty degrees, and at this time, the ghost head deflated three sensed that the situation was not good.

He actually forgot that there was still sea water gushing in at the tail!

In the normal emergency ascent, it is enough to empty the sea water in the bow of the boat, but now, there is still seawater pouring in the tail, and the attitude of the hull changes too quickly!

When the angle exceeds 30 degrees, there is danger!

"Quick, empty the tail ballast tank!" He was giving orders quickly, but alas, in a tilted hull, it was too difficult to perform such an action!

Several sailors wanted to let go of their hands, so they unscrewed the valve, and as soon as they let go of their hands, their bodies fell involuntarily!

The upward angle of the hull has exceeded 45 degrees!

On the entire submarine, the high-decibel voice of the ghost head resounded: "Quick, empty the tail water, otherwise we will all be finished!" ”

"Squeak, squeak!" Finally, a submariner reached the valve, and with all his strength, unscrewed an angle.

The compressed air started and was poured into the ballast tank, but alas, it was too late!

The rise of the hull continues, and the speed is getting faster and faster!

The entire thing inside the submarine fell towards the rear of the submarine, and that was because the back of the submarine was low, the front was high, and the angle reached seventy degrees, and it was still rising!

It's like a fishing float, it's light at the top and heavy at the bottom, and of course it's erected!

A long submarine, which was supposed to swim around in the sea like a fish, suddenly the fish stood upright, which looked a little funny, but, for the sailors on the submarine, it meant the arrival of death!

The submarine sails underwater, relying on the electricity of the battery, this ancient lead-acid battery, which has been used until later generations, is still serving the battery car and the red three-wheeler.

In order to prevent the explosion caused by overpressure due to excessive gas inside the battery, there are vents on it, and at the same time, unscrew the nut that opens the vents, which is also convenient for replenishing the electrolyte.

At the same time, such batteries are heavy, so, on the submarine, they are arranged at the bottom, so that the submarine is more stable.

When the submarine was erected, the battery pack was erected, and then, the terrible sulfuric acid flowed out of the vent.

Yes, it's sulfuric acid! Lead-acid battery, the electrode is a lead plate, and the electrolyte is sulfuric acid!

(There is no need to worry about the battery cars of later generations, because most of them are already sealed, which solves the problem of bubbles in charging.) ）

The surging sulfuric acid formed an ocean, and almost in a short period of time, it corroded the partition in the cabin, and at the other end of the partition was the terrible seawater!

In the small hole, the seawater poured into the battery compartment, met with sulfuric acid, and a violent chemical reaction occurred, and the continuous bubbles were tumbling upwards in transpiration, which was a large amount of hydrogen!

Then, the battery short-circuited, and a small electric spark detonated the hydrogen!

"Boom!" A huge explosion came from the direction of the battery compartment, and this explosion was even more violent than the explosion of the deep bomb!

In the violent explosion, the I-74 submarine was torn in half from the middle!

The turbulent sea water poured into the interior of the submarine along the fractured opening, and for each submariner, their time was measured in seconds.

Yaga!

Before the battery compartment was destroyed, the power supply to the entire submarine was interrupted, and the interior of the submarine was pitch black and turned into a cold steel coffin.

Listening to the sound of the seawater, the ghost only scolded one sentence.

Then, a huge sea of water enveloped him.

The I-74 submarine stopped afloat, broke in half, and continued to sink downward.

At this time, the surface ship Taylor was also rushing to the scene, and the sonar crew on the warship heard a loud sound underwater, and this kind of movement could only have occurred from a submarine explosion!

Depth charges will not cause such a big movement, and when the submarine suffers damage, the torpedo carried by the submarine may explode, and there will be this kind of sound.

Suddenly, everyone boiled and finally took out the German submarine!

With a huge explosion, a dead fish, slowly floating up from under the sea, accompanied by a huge diesel oil stain, it is certain that the target has been destroyed!

"Report, orders came from the command asking us to confirm the nationality of the target of the attack." The captain of the Taylor, Colonel Heim, received the order.

Confirm the nationality of the target? Isn't it Germany? Haim looked through his telescope at something floating on the surface of the sea in the distance, which was very strange, and then he found something on the surface of the sea.

A floating can, look at that shell, it's not a German military can, it's exactly like a canned rice from an island country!