The entry and exit compartment is composed of two parts, one is the normal exit on the top, and it can be sealed. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 infoAnother is that for underwater diving, it is necessary to increase the pressure in the tank to a greater pressure than the seawater pressure at the location, so that the seawater does not rush into the tank when the exit from the bottom of the submarine is opened.

The principle of the diving cabin is the opposite of the pressure cooker, Zhang Tao called Robert to buy a few air compressors and some hydrogen tanks, oxygen tanks and oxygen and hydrogen manufacturing equipment, this time Robert did not buy for Zhang Tao but opened a material and equipment company by himself, Zhang Tao guessed that Robert may have been stimulated by himself, and the materials and equipment he bought before and after were millions.

After Zhang Tao installed the tempered glass of the submarine, he put the submarine on the car with a crane and pulled it to the small lake of the farm, turned on the motor switch and pressed the dive button, and the water ballast of the submarine sucked in the water and slowly sank.

After swimming twice at the bottom of the lake, the submarine floated up, and the submarine was lifted to the car with a crane and cable and pulled back to the workshop. Zhang Tao sorted out the problems encountered by the submarine, the speed of water ingress in the pressurized water tank was relatively slow, which caused the submarine to dive slowly, and the window could only see the submarine's overhead perspective.

Zhang Tao rested for a few days to recuperate his energy. After checking some information at the school, he returned to the farm to renovate the submarine, and opened several flow holes on both sides of the lower layer of the submarine to channel the pressurized water tank, so that the submarine could quickly dive and float.

Zhang Tao built four more small submarines, which mainly placed cameras and signal transmission equipment, and put the small submarines under the bottom when the big submarines worked.

Submarines produce noise underwater that can be scanned by sonar from aircraft or ships. Zhang Tao bought some rubber and went to the workshop to make the rubber into pieces of tile.

Then use the remote control to direct the micron-level robot to drill many holes in the rubber tile, artificially drill the internal hole of the rubber tile with the maximum amount of noise absorption, and then use barnacle glue to glue the rubber tile to the wall inside the submarine.

Barnacle glue can only be seen from a distance for others and cannot be blasphemed, Zhang Tao is indeed very easy to melt the barnacle glue.

The vibration frequency of barnacle glue is measured by an instrument, and then the solid barnacle glue is shaken into powder with an ultrasonicator, and then sprinkled with water and then the oscillation frequency of the water is turned on, and the ultrasonic wave makes the water molecules rub violently, and the high temperature generated fuses the barnacle glue powder and water into a liquid state at high temperature.

After gluing the rubber tiles, Zhang Tao started the motor and tested the noise with the sonar equipment he bought, which was better than the sound absorption effect of military nuclear submarines. This time, the submarine was pulled to the lake of the farm for testing, and the water inlet of the pressurized water tank was particularly fast, and after operating the submarine to float, Zhang Tao came out of the stairs above the submarine and went to the shore.

Using the remote control to remotely control the submarine to start the engine and sink, turn, forward and other operations are all after pressing the button, the submarine reacts quickly, and it is not very sensitive when diving to 40 meters underwater.

Put the submarine underwater for a few days to test whether it can stand the test of time, and there are some places where the water leak will not be a problem in a short time, and it will take a long time to see it.

Back to the laboratory of the workshop to continue to study the problem of submarine communication under water, the sound in the water can be transmitted far away, thousands of meters are no problem, unlike the communication wave will attenuate in the water, Zhang Tao remembers when he was a child playing in the river, pick up two pebbles and hit each other, the sound will be very harsh, and it will not be very loud when it hits on the water.

If long-wave communication is used on the ground and the sea surface, the communication equipment on the sea surface converts the long-wave into sound waves and then uses sound wave communication with the submarine on the seabed, which perfectly solves the problem that the submarine cannot communicate with the ground in both directions in the sea.

In the data, it was found that infrasound waves are not easily absorbed in water and air, and when infrasound waves are emitted at very high frequencies, they will circle the earth several times. Zhang Tao's infrasonic device stores the infrasonic frequencies of dozens of land animals, and the remote operation of the submarine only has the names of up and down, left and right, start, shutdown and some equipment, and it is enough to write the frequencies of these land animals into the operation language.

The infrasound waves of land animals sent out in the sea will not have an impact on the creatures in the sea, even if they are intercepted by people, they will not have any effect, the infrasound wave is divergent propagation will not affect the reception of submarine submarines, the waves of the sea and the wind at sea will also produce infrasound waves, some dolphins and whales in the sea will emit infrasound waves, and the communication of infrasound waves in the sea is the safest.

Zhang Tao searched for a picture of ice floes on the Internet, and used stainless steel sheets to paint the shell of the small submarine with silver-white to disguise it as ice floes on the sea. In the Arctic Ocean, there are ice floes throughout the year, and when the time comes, it will be more like putting a layer of real ice chips on top of the small submarine to ensure that the satellites in the sky cannot see it.

Although the Icelandic coast guard has only 100 people, three ships, three helicopters, and one jet, two of which are still leased, no matter how small an army is, it must not be underestimated.

Zhang Tao read the information in the library of the University of Iceland, and in the decades after the founding of the People's Republic of China in 1944, Iceland beat away the British who came to the waters around Iceland to fish for cod n times, and finally the British gave in and no longer dared to steal cod in the waters around Iceland.

Even Britain, the overlord of the sea, could not defeat Iceland's small army of 800 people, and Zhang Tao had to be careful. Zhang Tao thought of all kinds of methods and rejected them one by one, and finally had to use the oldest method, waiting for the submarine to be transported to the sea when it was dark one day in Iceland.

When waiting for the opportunity, Zhang Tao was not idle, and a few women felt the underwater world in the small lake on the farm for a few days, looking at the seaweed and kelp and other plants in the water and then falling in love, and lived in the submarine every night, but after living for a few days, the underwater scenery was a little monotonous, and he still felt that there was no comfortable house on the shore and moved back to the house on the shore.

During the day, Zhang Tao was not idle, transforming the ultrasonic instrument into a waterproof cover, and welding several wide wheel racks that can move on the seabed to transport ultrasonic devices and other equipment.

Drilling a hole in the bottom of the sea will also bring seawater to the hole, and it is necessary to fasten a transparent cover on the bottom of the sea, Zhang Tao made a foldable cover with strong toughness of transparent plastic sheeting, steel plate and tempered glass.

Iceland is dominated by fishing and tourism, and does not produce industrial products such as cement and steel. Zhang Tao called Robert to buy dozens of tons of cement and steel bars, and asked him to transport them to the farm in Iceland, and he would have to build some other buildings in the future.

This time, Robert came over in person, and Zhang Tao invited Robert to visit the farm, and entertained Robert with vegetables produced in the farm. Zhang Tao asked Robert how he could open an arms company, and it would be convenient for him to sell missiles or something in the future.

Robert asked Zhang Tao if he wanted to change his career, Zhang Tao said that he was going to open it by a friend, and Robert was very pleasantly surprised when he heard it. After smiling and talking, please ask Zhang Tao to take more care of him, Zhang Tao asked the reason, Robert hinted that Zhang Tao was not working for the domestic government, Zhang Tao smiled and did not answer, which made Robert more convinced that Zhang Tao was a person with a big background.

After sending Robert away, Zhang Tao continued to study how to build a watertight underwater space on the seabed.