The Shanghai Museum is a tall atrium that leads to the sky as a radial hub, surrounded by four floors Arrange ten exhibition halls respectively, the exhibition hall combination is mostly a radioactive combination layout, each floor has two steps leading to the top and below, and there are huge supporting columns at the corners of the floors on all sides, and I found that above these columns, there are surveillance cameras, overlooking the direction of the exhibition hall from a high place, at the same time, the main entrance, There are surveillance cameras at the entrance of each exhibition hall on each floor, what people enter and exit, the layout of the alarm system can be described as decent, I have studied the building structure and layout, and know that the security technology of the museum does not exist any tricks, and there are already fixed routines: anti-intrusion alarm system, patrol system, access control system, video surveillance system, communication system, auxiliary lighting system, computer network system, centralized management center control system, power supply system, lightning protection system, transmission system, The recording system, this matrix monitoring system, is common to any museum, even the Shanghai Museum will not be an exception. The only difference is that there are more surveillance cameras in the Shanghai Museum, and there are fewer dead spots.

However, there are few dead ends, and it does not mean that there are no dead ends at all, for example, 360 wide-angle cameras without dead angles are installed on the four pillars, but because the camera itself is hung on the pillar, the pillar blocks the rear of the wide-angle camera, so if someone climbs up along the pillar, the wide-angle camera cannot shoot. In addition, the columns are decorated with potted rattan plants hanging down at the intersection of each floor and the corridor, and it is difficult to find them for a while if anyone is hiding there.

For example, at the entrance of the staircase on each floor to the passage to the toilet on both sides, there are two thick convex load-bearing columns on that side of the wall, and if a slender person hides through the load-bearing columns, the surveillance camera will not be able to capture it.

The bigger hole is that the ceiling height of the corridor surrounded by four sides is about 30 cm lower than the ceiling height of the corridor where the toilets on both sides of the corridor are located, which exceeds the thickness of the human body, and the camera is at the junction of the passage where the corridor and the toilet are located, that is, if someone has the ability of Spider-Man or gecko to stick to the wall, and can climb headfirst down on the ceiling of the wall, relying on the 30 cm zenith error to obstruct, from the perspective of the camera, it is not visible at all.

"There are a lot of blind spots. Without waiting for me to speak, Wei Wenlong opened his mouth in front of me, "Including the back of the column, the staircase, the one-square-meter area directly below the camera, the concave and convex section of the zenith, and the load-bearing column, there are at least thirty dead ends. ”

"You found out too?" I nodded, my gaze slowly wandered along the front of the surroundings, and then I stepped up the steps to the upper floor, "Wang Yong, the location of the jade Maitreya that was stolen yesterday is the jade area on the fourth floor?"

"That's right, it's the Jade Pavilion on the fourth floor. Wang Yong followed us and nodded suddenly.

"Go check it out. "I didn't talk nonsense, I walked directly towards the jade area on the fourth floor, because I checked the blind spots of the camera from time to time along the way, so in less than two minutes, I walked for a full five minutes.

When I entered the Jade Pavilion on the fourth floor with Yu Wenlong, the fox fairy suddenly stopped and said in a quick and soft voice:

"It's close. ”

The fox fairy's words became the best signal, hearing her words, my heart couldn't help but hang, my eyes quickly swept in the jade museum, and saw the beautiful white jade Guanyin Sanskrit plaque in the bulletproof glass display case, as well as the lifelike Tengyun boy jade statue, at first glance it looks simple and casual, but a closer look found that the outer wall is decorated with cloud patterns, and there is a dragon body flying in the Tang Dynasty cloud dragon pattern Kuikou jade plate.

"Which direction?" I narrowed my eyes slightly.

"......" fox fairy is still silent, and it seems that he still can't speak.

I breathed a sigh of relief, and when I saw her silence, I took a few steps forward until I walked into the exhibition area, and came to an empty glass display case, near which was surrounded by a small rectangular cordon, which had been drawn by the police to protect the scene of the crime. Obviously, this glass display case in the middle of the cordon was supposed to be the jade Maitreya.

I looked up and looked around the showcase, and saw that it was in a corner position, with a downward-facing surveillance camera on the wall directly above, but no 360-degree wide-angle camera.

Wang Yong pointed to the camera above the display case and said: " I also watched the surveillance video before, yesterday before the jade Maitreya of this showcase was stolen, this camera was still good, but the moment it was stolen, suddenly a strong flashlight-like thing rose from below, and the surveillance camera was lit up to snow white, which lasted for about ten seconds, and when the surveillance camera became normal, the angle of the camera was artificially reversed, turned to the upper left, resulting in the glass display case below not being seen, and then the Maitreya statue in the display case had been dropped after the camera turned back. And several cameras around them were also passive, and changed their orientation after being illuminated by the strong light, resulting in the thief's figure and face not being photographed at all, and then the thief deliberately turned the camera position back into the distance. This was only discovered when I checked the footage today. ”

"Yesterday there was an alarm system next to this showcase, right?" I asked.

"That's right, there was an infrared sensor in front of this showcase yesterday, which will be triggered as long as someone gets close to this showcase, but now things have been stolen and the showcase is empty, so the infrared alarm system here today has been stopped and taken for maintenance, and it has not been installed back yet, of course, there is no need to install it back, after all, everything has been stolen." Hey, that thief is really capable enough, he has been running away from the camera all the time, just like a ghost, and there is no way for people to figure out how he sneaked in and escaped, and came and went without a trace. ”

"Wenlong, what do you think?" After listening to Wang Yong's explanation, I looked at Wei Wenlong on the side and asked him for his opinion, at this moment Wei Wenlong was looking up at the direction of the ceiling, and a pair of deep eyes were full of thought, as if he was looking at something there.

"The thief clearly knew the structure of the exhibition hall inside out, and used clever tactics, such as bypassing the cameras, which could be blocked by curtains or smoke. But the thief apparently knew that there were smoke sensors in the museum, which would trigger the alarm as soon as there was smoke, so he resorted to a relatively cumbersome method of bright light interference.

Moreover, the thief also used some props to bypass the view of the surveillance cameras. However, you only need to list the cameras that have been manipulated and draw them on the exhibition hall map, and you can roughly guess the direction of the thief's movement according to the direction of the camera modification. Yu Wenlong said slowly.

"We've tried this reasoning method, but it's even more confusing, because we found that the location of the changed camera distribution is messy, and the thief seems to have expected that we will use the camera distribution method to search his movement route, so he deliberately set up interference. Moreover, what is even more incredible is that there are many places where the height of the camera cannot be touched by ordinary people, for example, some cameras are installed directly on the ceiling, according to your reasoning, unless...... That person can climb walls vertically and upside down like Spider-Man, otherwise it would be impossible to avoid the perspective of the cameras and not touch those cameras. ”

Wang Yong said a little helplessly and even creepy, and even his tone was much weirder:

"Now we staff are secretly suspicious that the artifact was stolen by a ghost or an invisible person, otherwise it would be impossible for a normal person to steal through such a strict alarm system and surveillance system. After all, the thief in the movie is fake, and there is no such mysterious thief in reality. ”

"Interesting. I smiled, "Strange thief...... Hehe. My gaze scanned the wall carefully, frowning slightly, my gaze moving from a gray-white jade claw to a lotus-shaped water bowl.

I didn't see anything from the scene of the theft alone.

I know that there are three major doubts about the mysterious thief so far.

One, how did that thief know all about the alarm system inside the museum?

Two, how did that thief get into the museum without triggering the alarm system and access control system?

I know that the US military has newly developed a wall-climbing device that uses pneumatic suction cups, and there are also "gecko tapes" produced by Van Waaldeli that uses the fine fluff of gecko toe molecules and the gap between the wall molecules, but the way to get those props is too difficult, and even if they do, they are too cumbersome to carry their shoelaces for easy theft. The third is that those props are impossible to support a person to climb the wall for a long time, for example, in 08, someone in the United States developed a gecko glove, but only climbed a section of the wall and slid down, and it seems impossible to climb as flexibly as the thieves in this museum.

"What kind of tricks did you use...... Being able to dodge the infrared siren means that the guy brought something like a sprayer and used the fog to capture infrared light...... But how did he manage to avoid the camera and climb the wall?" I squinted, curiously surveying every inch of my surroundings, deducing the thief's stealing modus operandi through a series of clues and image combinations.

And Wei Wenlong, who was similar to me, took a red date from his bag and stuffed it into his mouth from time to time, and then wandered around the sides of the stolen empty display case.