Su Mo and the others walked in cautiously, but not long after they walked in, viscous liquid dripped on them from time to time.

"What the hell?"

Sun Duoxiang looked up at the top of his head. In the night vision mode, he could clearly see the metal roof above his head, which was stained with many unknown objects, dripping from time to time. That's how the sticky things on the ground were formed.

"I don't know, but it is certain that there is no threat, so don't be distracted."

Su Mo reminded lightly.

"It's the boss, but then again, this passage is too long, right? Why does this base feel different from the normal one?"

Sun Duoxiang immediately concentrated, but he still felt a little fuzzy.

Su Mo didn't answer Sun Duoxiang's words, but was highly focused and vigilant around the surroundings, without a mecha for self-defense. If you are sneak attacked by stronger monsters, even if you have the second-generation mechanical armor, it is not impossible to be killed directly by luck.

Seeing that Su Mo didn't speak, Sun Duoxiang quickly shut up, for fear of disturbing Su Mo.

Time passed little by little, and the five Su Mo finally came to an end.

Suddenly, the eyes suddenly became bright, and everyone couldn't help but stop, showing shocked expressions.

I saw a towering, thick, and whitened metal closed door appearing in front of everyone. It looks very similar to the gate of a bank vault. There is a circular valve switch in the center of the gate.

As soon as they came here, Su Mo and the others clearly felt that the temperature had dropped a lot.

Lan Xi said suspiciously, "Why did the temperature drop so much?"

"This closed door is so cold."

Zhang Hao reached out and tried to touch it, and said in surprise.

"It's true, it's true, I rely on it, it's true, there won't be a freezer behind it, right?"

Sun Duoxiang was a little unconvinced and reached out to touch it, but he was also taken aback, it was really cool. This is still through the mechanical armor, and the temperature touch sensor device only feeds back the temperature, not the real touch state.

"I feel the same way."

Marco agreed.

Su Mo said in a deep voice, "Don't talk nonsense, try it and see if you can open it."

"Okay! Leave it to me!"

Sun Duoxiang volunteered to go up and turn the circular valve switch, but he was so strong that he couldn't turn it.

Zhang Hao and Ma Jian also reached out to help!

The three of them worked hard at the same time!

Ah~

His face was flushed with suffocation, but unfortunately there was no effect at all, so he finally had to give up.

"No, boss can't get it off."

Su Mo took a closer look and found that there was a very special cross keyhole next to it. There is also a rotating mechanical combination lock, which is somewhat similar to the security device of a safe.

Judging from the behavior that the three of Sun Duoxiang couldn't open, the door should be locked, so he replied lightly.

"I know."

"Then boss, what should we do?"

"It needs to be unlocked."

Su Mo stretched out his hand and pointed at the keyhole and the mechanical combination lock.

"Well, how do you open this? And this is not an electronic lock, how can it be cracked?"

Sun Duoxiang was suddenly worried, this kind of lock is the worst to open, even if you get an expert, it is not easy to use.

Su Mo also felt very troublesome. He carefully studied the lock and keyhole. It's a pity that the more you study the face, the more ugly it is. If there is a certain probability that the password lock can be cracked. Then this mechanical keyhole is really deadly, because they don't have a key at all.

He touched his chin and fell into deep thought.

Lan Xi and the others looked at Su Mo with expectant eyes. In their eyes, Su Mo was really omnipotent. Valley

An hour later.

Su Mo and the others sat on the grass outside the base with sad expressions on their faces.

Unfortunately, they have absolutely nothing to do with that lock.

"Boss, since it's not soft enough, let's make it hard. Let's just blow up that door with a bomb."

Sun Duoxiang suggested ruthlessly.

Su Mo replied calmly: "Don't dream, if it is another base, there is still a chance, but don't think about this base. You didn't realize that this base was specially built, and all the metal barriers are thickened, especially that The partition door, I have observed it, you can't use anything to blast it. Unless..."

"Unless what?"

Everyone curiously put their heads together.

"Unless a tactical nuclear bomb is used."

"cut...."

Everyone was speechless.

"Then I have no other way."

Su Mo couldn't think of a better way.

"Then what should I do, can it be true that I can only give up?"

Sun Duoxiang said with a frown.

Su Mo took out a bottle of mineral water and drank it silently. He was also in a very irritable mood now.

But there is no way. He has tried all kinds of methods, and the lock can't be opened at all.

Seeing that Su Mo didn't speak, Sun Duoxiang originally wanted to ask questions. Lan Xi stabbed him with his arm, signaling him not to disturb Su Mo.

Sun Duoxiang closed his mouth immediately.

Su Mo kept recalling the mechanical lock in his mind, and the password might be able to be deciphered by turning it and listening to the sound of the internal mechanical parts turning, but the key was very tricky.

That key is a special cross type, which means that the corresponding mechanical key is a special cross type key.

Thinking of this, Su Mo's expression suddenly moved slightly, and a picture flashed in his mind.

Dandan, the mutant monster who nearly killed them, seemed to have a special cross-shaped key hanging around his neck.

Wait, that city is not far from here, and if I remember correctly, the grandpa in the photo of Dandan really looks like a very knowledgeable person~lightnovelpub.net~ It is possible that this is the place researchers in the biochemical laboratory.

Thinking of this, Su Mo suddenly stood up.

"Brother, what's wrong with you? If you can't open it, try to find a way. Don't worry."

Sun Duoxiang and the others were also taken aback by Su Mo's abnormal reaction.

"You are all here waiting for me, I will come when I go."

After Su Mo finished speaking, she climbed onto the mecha and then controlled the black steel messenger to leave.

Only the few Sun Duoxiang who looked at each other were left, but they still believed in Su Mo very much. Since Su Mo asked them to wait, they just waited here obediently.

After a long time, Su Mo drove the black steel messenger back to the occupied city again.

As always, there are a large number of zombies wandering around here. After they heard the movement, they were attracted and rushed towards Su Mo frantically.

It's a pity that Su Mo directly ignored them. The heavy black steel messenger mecha was like a bulldozer.

Of course, this zombie is not completely useless, at least it can stain the appearance of the Black Steel Apostle Mecha.

Su Mo relied on her memory to walk towards the location where Dandan was chased and killed. Although it has been so long, she may still be active in that area.

Now Su Mo is not worried about finding her, as long as she is still in this city, it is only a matter of time before she is found.

The most fearful thing is that she was killed by other players, and her things were taken away by others, so there was no way.