Ling Feng shook his head and said, "There is nothing we can do about it. Professor Xia, you also know that the bureau has really few manpower recently."

"Oh, it's my fault that I didn't think carefully enough. In fact, we have a few people here who can join in this operation, but..." Professor Xia paused.

He always felt like he was about to say something, but suddenly he couldn't remember.

"Forget it, let's not talk about those useless things. Where should we go now, should we still follow the original plan?" Professor Xia asked.

"Well, let's continue."

Ling Feng took a few steps and suddenly caught a glimpse of a backpack from the corner of his eye.

The backpack was just not far from Professor Xia, but it did not belong to any of them.

He pointed to the backpack on the ground and said, "Professor, wait a minute, I found something."

"Could it be someone from before who stayed here?" Professor Xia opened his backpack and sighed, "Oh, the things inside are quite complete."

He turned his backpack upside down and found not only some common tools, but also food and water sources.

"Perhaps we don't have to worry about food. There is also water here. The owner of the backpack should be a veteran who often travels in the field. All the food in his bag is high in calories and easy to carry." Lingfeng sorted out the supplies.

He also prepared a set of tools, so he didn't need to carry extra ones.

His idea was that the backpack must have been left over from a few years ago and some of its contents might have deteriorated.

They can pick out food that has not expired or has not expired for a long time, and put the rest back into the backpack for emergencies.

Now that they have enough food, there is no need to risk eating long-expired food.

But no one can guarantee that their food will be enough to support them leaving the institute.

However, when Ling Feng picked up a chocolate bar, the expression on his face froze.

"What's wrong? Is the food expired?" Professor Xia comforted him, "It's okay, we brought our own food, didn't we? It's enough for us to last a few days. Besides, we're not trapped. You’ll be out soon.”

"No, the production date above was two days ago..." Ling Feng said slowly.

He quickly checked the production dates of all the food. All the unopened food was produced within three days, and the opened box of chewing gum was produced less than a month ago.

Professor Xia quickly understood what he meant, and he hesitated: "In other words, there are others? But why doesn't he even want his own backpack..."

"I don't know, maybe I'm lost, maybe I'm in danger." Ling Feng calmed down.

He only picked about one-third of the food, plus the food they brought with them, and saved some food, which was enough for him and Professor Xia to last for five or six days.

He put everything that was left back in its place.

Although he didn't know whether the person was an enemy or a friend, he hoped that the things he left behind would come in handy.

After passing through the cold corridor, they finally saw the first unlocked door.

There was a series of numbers written on the door plate, which seemed to be the laboratory number.

Lingfeng turned the door handle, and a pungent chemical smell filled the air, making the two of them cough.

When the two of them noticed the scene in the room, the expressions on their faces became particularly solemn.

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