There is a unique cave in the cave, which is closely guarded.

   After Xu He checked his identity and password, Su Haitang also handed over his soldier's card. After being repeatedly checked and questioned, he was released smoothly.

  The two finally stopped after turning the twisting secret passage.

   Xu He motioned her to pay attention to the movements of his hands.

   "Remember? You can use this secret room in the future. Only you are allowed to enter. It must be kept strictly confidential, understand?"

"Yes!"

  Su Haitang replied seriously.

   Xu He closed the door and motioned her to open the combination lock independently.

   This trivial matter is not a problem, Su Haitang's fingers fly, press the password, and the door opens with a sound.

  Su Haitang stepped forward and looked at the transmitter, her blood began to boil!

   She sat over and listened carefully to Xu He's introduction to the specific operations, and quickly got started.

   Morse code is not difficult, but it is difficult to encrypt during the transmission of radio information.

   But it couldn't help her. Su Haitang agreed with her grandfather in advance on the decryption method, and the score of "Reverse War" was combined with the new version of "Three Character Classic".

   These two are "original creations" that she copied. They haven't been released yet, but they will be released soon.

  The decryption method is more complicated, which means the security of information transmission and the increase of the difficulty level of writing information.

   But Su Haitang doesn't care.

   With space in hand, she can try to write encrypted information as many times as she wants without fear of leakage.

   After the first message was sent, Su Haitang turned off the machine with satisfaction and got up to open the door.

   "I learned it? Do you want to practice again? Don't worry about dinner, come to my house to eat when the cafeteria is closed."

  Xu He was waiting outside. Seeing her coming out so quickly, he was slightly surprised and kindly suggested.

  Su Haitang smiled and shook her head.

   "It's been out long enough, go back first, so as not to attract attention, and come back tomorrow as well."

  Although Auntie's towel was powerful enough and the blood volume on the first day wasn't too much, Su Haitang didn't dare to delay any longer, for fear that a blood-stained demeanor would be embarrassing.

  Xu He also thought of something, his face turned red again, he coughed dryly, checked the door she had closed, and took her out.

   "Tomorrow I'll bring you here again to get acquainted. If there is anything you don't understand, just ask, and you'll have to come over yourself in the future."

"Yes."

  Su Haitang agreed.

  The two were checked out all the way, and they even passed the metal detector twice, which was extremely strict.

   "Report! Comrade Peng Man was poking his head outside, following you all, but he never left." The outermost sentinel stopped Xu He to report.

   "I'll get her away." Xu He's face was pitch black, he nodded awkwardly, and hurried out.

  Su Haitang was equally embarrassed.

   Sister-in-law is following them?

   Do you suspect that she has something to do with the battalion commander?

  Eh, it's really hard to explain that a man and a woman avoid people and drill into the cave.

   Battalion Commander, please take care.

  Su Haitang put some wax on Xu He silently, and asked the sentinel with a dry smile, "Is there any other way out?"

   She didn't want to be caught, the two of them appeared together, even jumping into the Yellow River couldn't wash them away.

"follow me."

The    sentinel looked at her sympathetically, took her to the right, walked about three meters and knocked on the stone wall on the right hand side, three long and two short.

The    stone wall quickly opened from the inside, and a person came out.

   "Take her to Channel 6."

  Su Haitang signed and stamped on the book, and followed the instructions of the soldiers inside, smearing it and moving forward.

   Turn right at 500 meters, go down the stairs at 300 meters, knock on the door after 420 steps, two long and two short.

  The door is opened, check the registration at the checkpoint, and continue the next journey.

  Su Haitang walked very fast and left the last door in less than ten minutes.

   "Secretary."

  Su Haitang came out, looked around in surprise, and suddenly smiled.

   "Go back."

   Zhang Yuqing waved her hand and let her go back to the dormitory.

   "Bring back this registration form. It's not impossible for your class to have more shows in the singing competition, but try to arrange for as many comrades to participate. This is not a special concert for someone."

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