What was sprayed from the nozzle was not liquid nitrogen, but liquid carbon dioxide in the form of a white mist.
Its temperature is -78.5 degrees Celsius, which is much "milder" than liquid nitrogen at -196 degrees Celsius.
Before using liquid nitrogen for deep freezing, this high-temperature coolant is usually used to "pre-cool" the target area.
This is to allow the metal casing, especially multi-layered structures made of different materials, to have a process to adapt to temperature changes.
This minimizes thermal stress caused by drastic temperature changes, which could lead to instantaneous embrittlement or microcracks in the outer shell.
The pre-cooling process lasted about one minute, with Chen Ting controlling the flow rate to ensure the white cold mist evenly covered the target area.
After completing the precooling, he put down the carbon dioxide nozzle and then took the actual liquid nitrogen nozzle from Xu Xinyi's hand.
The next step is the main freezing stage, which requires meticulous operation.
He gently pressed the control valve, and extremely low-temperature liquid nitrogen was sprayed out in a fine mist, precisely covering the pre-cooling area.
Hold for only 2 seconds, then immediately release and pause for 5 seconds.
This cycle repeats itself.
Chen Ting uses an intermittent, low-dose pulse spray method.
The two bomb disposal police officers standing next to him had some doubts about Shen Ting's bomb disposal skills.
But upon seeing his technique, the two realized that Shen Ting truly knew how to defuse bombs.
If liquid nitrogen is sprayed directly in large quantities, the metal casing will contract rapidly due to the low temperature, generating enormous stress.
It may even form microcracks.
The bomb casing has a 'sandwich' structure.
If a crack causes an accidental connection between the inner and outer conductors, or damages the insulation layer, the consequences are predictable.
The two bomb disposal police officers gained much more confidence in Shen Ting.
The two leaned forward, their eyes fixed on the screen of the X-ray imaging machine.
To be precise, it was on the bright white blob representing the mercury cavity on the screen.
"Observe the changes in the state of the mercury."
While maintaining a precise spray rhythm, Shen Ting reminded:
"Under X-rays, liquid mercury typically appears as a smooth, mirror-like bright area on its surface."
After solidification, the volume may change slightly.
More importantly, the edge morphology of its X-ray image may become slightly irregular.
Or there may be subtle changes in texture inside.
This is the key to determining whether the mercury has completely solidified.
Tell me immediately after the mercury solidifies…
Time passed slowly amidst the hissing sound of the liquid nitrogen jet.
On the X-ray screen, the bright white mass representing mercury seemed to be developing a very subtle, blurry effect at the edges, unlike the appearance of a liquid mirror…
...
"Holy crap, is he going to defuse a bomb?!"
In the live stream, a netizen with the ID "Keyboard Warrior Ben Gang" left a comment.
"Didn't we just contact a bomb disposal expert to come over?"
Aren't we waiting for bomb disposal experts?
"Peace is a curse" followed closely behind.
"Holy crap, Team Leader Shen really went in himself? That's incredibly brave!"
"No matter how brave you are, you can't just defuse a bomb directly!"
He's not a bomb disposal expert.
"That's right, you can't just touch bombs!"
Numerous questions and comments scrolled through the live stream.
Most viewers understand that defusing a bomb and solving a crime are two different things.
The latter relies on logic, observation, and reasoning.
The former relies on an understanding of the bomb's structure, meticulous operational techniques, and a calm mindset.
Completely different!
Even professional bomb disposal experts can't guarantee success every time...
"My cousin is an engineer in the army. He told me that all the brothers in the bomb disposal team have signed a life-or-death contract."
He always wrote his will beforehand before going on a mission.
"And fewer and fewer people are learning this stuff, right?"
I've heard that many related majors are struggling to fill their quotas; what parent would want their child to do that?
A wave of worry and confusion swept through the comments section.
...
On the pitch-black asphalt road.
The sirens pierced the silence of the night.
Two police cars, flashing red and blue lights, led the way.
A distinctive police van was speeding behind us.
Inside the car, bomb disposal expert Lu Guotao stared in astonishment at the tablet computer in his hand.
The screen was showing footage of Shen Ting defusing a bomb inside an abandoned mine.
"Team Leader Shen is actually going to do it himself?"
Lu Guotao muttered to himself, his voice filled with disbelief:
"Didn't you say you'd wait for me to come?"
But upon further reflection, he understood Shen Ting's thoughts.
"If I had to go there to operate, at least two of the bombs in the city would have exploded."
Team Leader Shen was clearly trying to save time and minimize casualties.
He fully understood and even admired this motivation.
If Shen Ting can defuse the bomb, this is indeed the best option.
But--
"Team Leader Shen... do you know how to defuse bombs?"
Lu Guotao frowned, recalling his extremely brief phone call with Shen Ting.
Judging from the content of their conversation at the time, Shen Ting was definitely not a bomb disposal expert with practical experience.
"Wow, Team Leader Shen's movements are quite professional!"
Lu Guotao watched in astonishment as Shen Ting used liquid nitrogen to freeze the level in the live stream—
Perfect pacing, precise coverage, and clear objectives!
"This move... doesn't sound like a newbie's!"
"It seems that Team Leader Shen should know how to defuse bombs."
Otherwise, we wouldn't act rashly.
"Teacher Gao said that Shen Ting is not only good at solving cases."
Moreover, they often do things that are beyond the comprehension of ordinary people.
Just as I thought!
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