Chapter 616:

"Roar!!!"
In the night sky, the tractor beam dropped from the Jade Emperor-class space battleship directly and firmly locked the pterosaur in the air.
The pterosaur was frantically fanning its wings, trying to get as much power as possible, so as to break free from the shackles of the electromagnetic traction beam.
However, how can the power of science and technology be able to break free?
In the end, this pterodactyl, and the pale silver little glutton who rides on it like a master of how to train a dragon, can only watch as it flies towards the Jade Emperor-class cosmic battleship.
"Kacha! Bang!"
In the next second, a large steel cage flew down from the Jade Emperor-class space battleship.
This steel is also made of liquid metal, and ejectors are installed around the cage to allow it to fly in the sky.
The large steel cage immediately shut the pterodactyl and the pale silver little glutton in.
"Wow!"
Soon, these two alien beings could only watch as they flew into the night, and then disappeared in the night sky.
So far, all the alien life that raided Datang Technology, except for the captured pterosaurs and pale silver gluttons, were all annihilated by humans.
Ye Fan didn't know whether the alien life he annihilated caused serious damage to them.
But at least from the current situation, it can be seen that these alien life are not invincible existence, they also have weaknesses, and they can also be sanctioned by technology.
"Starting seismograph monitoring across the country, and starting to monitor all suspicious underground activities across the country for 24 hours, to prevent surprise attacks from happening again."
At this time, after annihilating all alien life, Ye Fan once again issued an order through Origin.
Subsequently, a holographic projection of a national map appeared again in front of Ye Fan.
This time the holographic projection is divided into two sides. What Ye Fan sees on this side is a large-scale topographic map of the country, which can accurately see the complete topography of a certain area.
What the reporter saw on the other side was just an ordinary map of the whole country, no different from the maps circulated on the Internet.
The topographic map is actually one of the military secrets. In the face of such a live broadcast, Ye Fan did not want to reveal unnecessary things.
This time, Ye Fan built underground vibration monitoring points all over the country, which are used to prevent these alien life from attacking the "Skynet" radar.
Previously, the seismic monitor was not turned on in real time, but was set to scan every 30 minutes to save energy to the greatest extent.
Because the seismic monitor has to be buried deep underground, it cannot rely on solar energy and other things to supplement energy. At the same time, its size is very small and can't hold too large batteries.
Even the super battery with the largest capacity under the same volume can only support the seismic monitor to scan once every 30 minutes, lasting for half a year.
If real-time scanning is enabled, suspicious vibrations will be scanned every second, and the data will be calculated to exclude cars or ordinary geological movements, and the most accurate data will be calculated and sent to the Datang Technology headquarters.
This requires very large energy consumption.
Therefore, each seismic monitor can only provide 48 hours of battery life if the full power is turned on once every second.
After the electricity is exhausted, they must be dug out from the ground, new batteries installed, and then buried deep underground.
This requires very expensive engineering.
Therefore, it is best to scan with scale and interruption.
However, it is also easy to find out the scanning rules, so as to avoid the scan interval for surprise attacks.
But Ye Fan issued a full power to turn on the seismic monitor, which was obviously determined.
He wanted to hide the whole country under the ground, and he was ready to make a surprise attack on the extraterrestrial life, all in one fell swoop within 48 hours.
If they can't be wiped out within 48 hours, then the enemy once again launches a surprise attack from the underground using tunnel bugs, then they can only be on the passive side.
The technology of earthquake monitors was acquired by Ye Fan after a lot of prestige points. At the same time, the cost of each one was very high.
For deep-buried layouts across the country, the cost alone is as high as 150 billion, excluding subsequent maintenance costs.
The technological content of the seismic monitor is very high. It is not the same as the seismograph invented by Zhang Heng in ancient times, but the principle is actually the same.
Zhang Heng lived in the Han Dynasty and the Eastern Han Dynasty, and earthquakes were frequent. According to the "Book of the Later Han Dynasty·Five Elements" records, a total of 26 major earthquakes occurred in the 30-odd years from the fourth year of Emperor Yongyuan (92 AD) to the fourth year of Yanguang An Emperor (125 AD).
The earthquake zone is sometimes as large as dozens of counties, causing ground cracks, landslides, collapsed houses, and flooding of rivers, causing huge losses. Zhang Heng had a lot of personal experience of the earthquake.
In order to grasp the national earthquake dynamics, after many years of research, he finally invented the Houfeng Seismograph in the first year of Yangjia (AD 132), the world's first seismograph.
At that time, this instrument was used to successfully predict an earthquake in the western region, which attracted the attention of the whole country. This is more than 1,700 years earlier than the history of using instruments to record earthquakes in Western countries.
In November Renyin of the third year of Emperor Yangjia of the Han Dynasty (December 13, 134 AD), a seismograph's dragon machine suddenly started, spit out a copper ball, and fell into the toad's mouth.
At that time, the people in Jingshi (Luoyang) didn't feel the signs of the earthquake at all, so some people began to talk about it, strangely moving.
Within a few days, someone from Longxi (now Tianshui area of ​​Gansu Province) quickly reported it to EbookFREE.me to confirm that an earthquake had indeed occurred there a few days ago, so people began to be extremely convinced by Zhang Heng's superb technology.
Longxi is more than a thousand miles away from Luoyang, and the seismometer is correctly marked, indicating that its seismic sensitivity is relatively high.
However, due to the long history of Zhang Heng's seismograph, it has been lost, and there are no actual objects and drawings, but some brief written records.
From ancient times to the present, many people have questioned the authenticity of seismographs, but whether seismographs actually existed is unclear.
Of course, if it really exists, then the level of technology at that time is very high.
After all, how to distinguish between nearby and distant vibrations, and distinguish whether it is a vibration caused by a carriage passing by, or a vibration caused by a collapse of a house, a crowd surging, etc., or a real earthquake in the distance, are not made of ordinary copper and iron. Predictable by the manufactured shelf.
This requires ultra-high-precision sensors, high-power underground sonar systems (power enough to allow sound waves to penetrate solids), high-intensity computers that can undertake data analysis and processing, and powerful energy sources. a little.