In the depths of the South Pacific Ocean seabed, an undersea city of the New New Human Association is located on a submarine mountain beam, the mountain beam is actually a submarine bulging slope, the top is very flat, in this more than 1,000 meters of deep sea seabed, it is pitch black all year round, the water temperature is kept at about zero degrees Celsius all year round, occasionally a few deep-sea eels and rays swim from the mountain beam, because there is no sunlight, there are no undersea plants here, not even plankton, although the environment is cold, but there is a very stable water body here, the wind and waves are calm.

Professor Zhang Keming was sitting in his office in the underwater composite building, and the just-concluded meeting of the 'Group of Five' cast a shadow over his mind, and the grim situation had led to the possibility of revising many of his recent research plans. The name of this building was given by Zhang Keming himself, because he liked the classical novel "Journey to the West", he simply named this deep-sea building the Crystal Palace, after nearly 30 years of continuous construction, the scale of the Crystal Palace has been very large. Unlike Kosuke Sato's Turtle City, the Crystal Palace is built in a modular way, with the appearance shaped like a container sunk into the sea, but the volume is smaller, and all the rectangles that make up this 'container' are small The container's cabins are combined to form a very stable and sturdy whole, which can be separated when needed, and move freely with its own all-electric water jet power system, which is similar to the structure of the space city, because the chief designer is Zhang Keming, who likes the modular combination design, because it is flexible and practical.

The main transportation and defense tasks of the underwater base are undertaken by MSI Hummingbird B-18 and Hummingbird A-20, nearly 100 Hummingbird A-20 are enough for the daily use of this huge underwater city, but if an accident occurs, Zhang Keming is very worried that he will not be able to deal with it, the only one who can support him is the mountain base in charge of Tong Jiwu, the number of Hummingbird A-20 is more but also limited, and Feimeng's space city is too far away to come to the aid in a few days.

Feeling that the situation was critical, Zhang Keming called Dr. Gong Qingguo, who had been in charge of marine research, to study how to deal with the current situation. The two are of the same age and have similar temperaments, but Gong Qingguo seems to be more calm and older, Zhang Keming is responsible for the construction and management of the undersea city, and Gong Qingguo has been concentrating on the research projects and research progress of various research groups, and the two have cooperated very tacitly. Under their management, the city is now self-sufficient, taking energy, materials and food from the sea, and can produce surplus antimatter fuel cells, new composite materials, and equipment such as the MSI Hummingbird A-20 for the city. Recent research by Dr. Gong Qingguo also found that there may be a large amount of water at a depth of nearly 1,000 kilometers under the earth's crust where they are located, and the entire body of water may be more than all forms of water on the ground combined.

Gong Qingguo also heard Zhang Keming often talk about the current situation, but he didn't expect that the latest judgment of the 'five-member team' was that the war with the Black Eagle Society was about to break out, and after nearly 30 years of silence, the strength of the Black Eagle Society was extraordinary, Gong Qingguo, who usually only cared about scientific research, was also worried at this time, and suggested to Zhang Keming: "Is it better to disperse the Crystal Palace to a few of our alternative sea areas, now we have a small submarine research laboratory under the Arctic Ocean, all of which are concentrated here, Isn't it too dangerous. ”

Listening to Gong Qingguo's suggestion, Zhang Keming nodded and said: "I'm also thinking about this problem, it turns out that we have set up some underwater electronic beacons as a warning and confusing the enemy, but judging from the current situation, these beacons have been approached by unknown man-made objects, but the information obtained is very small, and it is impossible to analyze the specific situation, I now think it may be the reconnaissance team sent by Sato and Li Kang, their Black Hawk can also be visually stealthy, and they will use a blue-green laser communication system underwater, Our electronic beacons can't be detected visually, and they can't intercept laser communications, so I don't think the situation is good, but there is a danger that they will be broken by each one if they are too scattered......"

When they were discussing countermeasures, the person in charge of the security group asked for a call through the 'super string', and he said with some panic on the screen: "Our electronic beacons set up in different waters and depths show that a huge country A aircraft carrier battle group is directly above us, and a nuclear submarine has just quickly descended to the seabed near us, a distance of about eight nautical miles, and the passive sonar system has found that two nuclear submarines that were originally passing normally have turned around and are coming from different directions near our submarine city. It's less than fifty nautical miles away. ”

Zhang Keming was also a little surprised, this is a very unusual thing, although there are warships often passing through this sea area, but few fleets have stopped, and the nuclear submarines come from different directions, and the obvious target is the Crystal Palace of the undersea city. After a little thought, he ordered: "You send three squadrons of twelve Hummingbird A-20s to the vicinity to observe the situation, and no force is allowed to be used unless absolutely necessary, and at the same time, let the three squadrons of A-20s be ready for battle, all equipped with proton torpedoes and missiles, in case of accidents; In addition, do not turn on active sonar and other equipment, use passive equipment to detect the situation, be careful not to use underwater spotlights, and from now on, all portholes and exterior lighting equipment near the sea in the city will be subject to lighting control. The neutrino communication system is secure and can be used normally; The stealth devices are all activated. After issuing several directives one after another, Zhang Keming decided to immediately get in touch with Fei Meng to report the unexpected situation and discuss countermeasures.

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More than a thousand meters of seabed, for the Illinois-class attack nuclear submarine is already the limit of diving, under the huge pressure of the deep sea water, the occasional creak of the hull makes the sailors on several submarines who came to the rescue shudder, but at this time time is life, there is no time for them to pray devoutly. For the high-level, the equipment and weapons on the submarine are the most important secrets, so the two nuclear submarines that arrived at the sunken sea area were rescued first, first established a submarine cordon, and released three miniature unmanned submarines to guard and search for the exact location of the 'wrecked' nuclear submarine nearby.

General MacKaser was worried about the lack of underwater forces, so he urgently transferred two old but modified Virginia-class nuclear submarines and two Illinois-class nuclear submarines from nearby island bases to provide support, and in less than ten hours, the number of nuclear submarines near the wrecked area of the Chicago had reached six, and they had established three-dimensional underwater defense circles from different depths.

After receiving Zhang Keming's report on the situation, Fei Meng felt that the matter was very important, and immediately convened an emergency meeting, and after the seven members of the "five-person team" and Dr. Gong Qingguo discussed the results of the investigation and the current situation, they judged that a nuclear submarine in the aircraft carrier formation had an accident, and the submarine arriving from different directions was for rescue, and suggested that Zhang Keming should be prepared for emergency evacuation, but do not move and evacuate the submarine city until it is absolutely necessary, because the distance is too close. The moving and evacuating undersea city components could be detected by the submarine's active sonar system, at which point it could develop into a confrontation between the two sides, at which point both sides are sensitive, and the confrontation is likely to turn into an exchange of fire. At the same time, Fei Meng asked Tong Jiwu to be prepared to support possible critical situations at any time. After the meeting, Zhang Keming immediately began to prepare for the evacuation, and the entire Crystal Palace was mobilized, carrying out various preparations, and closely monitoring the movements of the aircraft carrier fleet and six submarines.

Near the sinking point of the Chicago, the underwater life-saving equipment on the fleet supply ships had been transported from the bilge to the deck and into the sea, and after the preparations were completed, after determining that the Chicago could no longer float, MacKaiser ordered the hull to be cut, and the arranged cutting chain began to turn, starting from the middle of the Chicago. A few hours later, the Chicago was split in two, the hydraulic towing equipment parted the hull, and a gap more than a person's width was revealed between the two sections, and several divers in heavy diving suits entered the cabin and began to search for possible surviving crew members.

After several days of rescue, some of the crew members of the submarine were finally rescued from different isolation compartments, and about forty or fifty people survived, and no one on board the Chicago was left alive in terms of time. MacKaser relaxed the nervousness of the past few days, and he knew that at least he could give an account to Congress, and the most important thing was to salvage the wreckage of the submarine as soon as possible, and not leave any secrets on the bottom of the sea.

Many of the pontoons were slowly attached to the Chicago's hull, and as soon as a certain number of them were emptied of the water in the pontoons, the wreckage of the Chicago was able to rise to the surface.

Zhang Keming has been nervously following everything that happened in the sunken area these days, and the monitoring information reported by the monitoring center was quickly deciphered by the 'superstring', and the content showed that the wrecked submarine would be salvaged in two days. Zhang Keming breathed a sigh of relief, as long as the fleet left, the crisis would pass for the time being.

However, the accident still happened, because the rescue operation took too long, General MacKasher began to worry that an enemy submarine came to this sea area to spy on the situation, waiting for an opportunity to obtain information, he ordered the nuclear submarine in charge of vigilance to expand the warning range, turn on the active sonar system, and look for possible threats. The active sonar systems of the two Illinois-class attack nuclear submarines detected something on the seabed eight nautical miles away almost simultaneously, and the data link aggregated the information and transmitted it to the supercomputer on the carrier, which quickly analyzed that it was a man-made object with a regular shape. MacKaser was shocked when he received the report, he could not accurately judge the number and attack ability of the 'enemy' for a while, in order to avoid further losses, he immediately ordered all rescue operations to be stopped, all nuclear submarines to withdraw from the nearby seas, and prepare depth charges to attack all possible spies.

Several Krupp-class destroyers fired hundreds of heavy depth charges at the target sea area at a depth of 800 meters, 1,000 meters, and 1,200 meters on the seabed.

When Zhang Keming got the monitoring information of the 'superstring', the depth charge had been launched, splashing from the air into the sea, and the passive sonar system of the Crystal Palace also monitored the sound of the depth charge entering the water almost at the same time, and Zhang Keming had to order the whole group to evacuate at full speed with some desperation.

The explosion of depth charges was heard from all directions, and a huge shock wave swept through the entire sea bottom waters within a few nautical miles. The evacuating Crystal Palace was unable to fully escape the range of the depth charge blaster, and the Crystal Palace was pressed against the seabed where it had left......

After the attack, it took a long time for the bottom of the sea to slowly return to calm, and the bodies of many sea creatures killed by depth charges surfaced, and the sea was a mess, and MacKaser looked at the effect of the attack, and a hideous smile appeared on his face.