Chapter 151 Unknown Liquid

Su Mo and the others cautiously walked inside. However, not far in, they began to feel a viscous liquid dripping on them from time to time.

"What the hell is this stuff?"

Sun Duoxiang looked up. In night vision mode, he could clearly see a lot of unidentified clumps of stuff on the metal ceiling above, dripping down from time to time. The sticky stuff on the ground was formed in this way.

"Not sure, but it doesn't seem to be a threat, so don't get distracted."

Su Mo reminded them calmly.

"Yes, boss. But speaking of which, this passage is a bit too long, isn't it? This base doesn't feel quite normal."

Sun Duoxiang immediately focused his attention, but he still felt a little creeped out.

Su Mo didn't answer Sun Duoxiang. Instead, he concentrated his mind and vigilantly watched his surroundings. Without mecha for protection, being ambushed by a slightly stronger monster, even with the second-generation mechanical armor, would be unbearable. It was not impossible to be instantly killed with a bit of bad luck.

Seeing that Su Mo didn't speak, Sun Duoxiang quickly shut his mouth, afraid of disturbing him.

Time passed bit by bit, and Su Mo and the others finally reached the end.

Suddenly, a wide-open space appeared before them, and everyone couldn't help but stop and show shocked expressions.

A towering, thick, and pale metal sealed door appeared before them. It looked very similar to a bank vault door, with a round rotating valve switch in the center.

As soon as they got here, Su Mo and the others clearly felt the temperature drop a lot.

Lan Xi said in confusion, "Why has the temperature dropped so much?"

"This sealed door is so cold."

Zhang Hao reached out to touch it and said with surprise.

"Really? Damn, it really is. Is there a freezer behind this?"

Sun Duoxiang didn't believe it and reached out to touch it as well. As a result, he was also taken aback; it was indeed very cold. This was still through the mechanical armor, with the temperature sensing device feeding back the temperature, not even real contact.

"I feel like it too."

Ma Ke echoed.

Su Mo said in a deep voice, "Stop talking nonsense, try it and see if you can open it."

"Okay! Leave it to me!"

Sun Duoxiang volunteered to go up and turn the round valve switch, but he exerted all his strength and couldn't turn it.

Seeing this, Zhang Hao and Ma Ke also reached out to help!

The three of them used their strength at the same time!

"Ah~"

Their faces were flushed, but unfortunately it had no effect, and they had to give up in the end.

"It's no use, boss, we can't open it."

Su Mo carefully observed it and found that besides a very special cross-shaped keyhole, there was also a rotating mechanical combination lock, a bit like the security device of a safe.

Judging from the fact that the three of Sun Duoxiang couldn't turn it, this door should be in a locked state, so he responded calmly.

"I know."

"Then what do we do, boss?"

"It needs to be unlocked."

Su Mo stretched out his hand, pointing to the keyhole and the mechanical combination lock.

"How, how do we unlock this? And this isn't an electronic lock, how do we crack it?"

Sun Duoxiang was immediately worried. This kind of lock was the most difficult to open, even if you brought in an expert.

Su Mo also felt very tricky. He carefully studied the lock and keyhole. Unfortunately, the more he studied, the uglier his face became. If the combination lock had a certain probability of being cracked, then this mechanical keyhole was really fatal, because they simply didn't have the key.

He stroked 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.

An hour later.

Su Mo and the others sat on the grass outside the base with worried expressions.

Unfortunately, they had no way to deal with that lock at all.

"Boss, since the soft approach doesn't work, then let's take a hard approach. Let's just blow the door open with a bomb."

Sun Duoxiang suggested fiercely.

Su Mo replied calmly, "Don't dream. If it were another base, there might be a chance, but don't even think about this base. Haven't you noticed that this base is specially built? All the metal walls are thickened, especially that partition door. I've observed it, and no matter what you use to blow it up, it won't work. Unless..."

"Unless what?"

Everyone curiously put their heads together.

"Unless you use a tactical nuclear bomb."

"Tch..."

Everyone was speechless.

"Then I have no other way."

Su Mo couldn't think of a better way either.

"Then what do we do? Is it really just giving up?"

Sun Duoxiang said with a sad face.

Su Mo took out a bottle of mineral water and drank it silently. He was also feeling unusually irritable.

But there was nothing he could do. He had tried various methods, but the lock simply couldn't be opened.

Seeing that Su Mo didn't speak, Sun Duoxiang originally wanted to continue asking. But Lan Xi poked him with her arm, signaling him not to disturb Su Mo.

Sun Duoxiang immediately closed his mouth.

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

That key was a special cross shape, which meant that the corresponding mechanical key was a special cross-shaped key.

Thinking of this, Su Mo's expression suddenly changed slightly. A picture flashed in his mind.

It seemed that the mutated monster, Dandan, who almost killed them, had a special cross-shaped key hanging around her neck.

Wait, that city wasn't far from here, and if he remembered correctly, Dandan's grandfather in the photo looked like a very knowledgeable person. It was really possible that he was a researcher at this biochemical laboratory.

Thinking of this, Su Mo suddenly stood up.

"Brother, what's wrong? If you can't open it, think of another way. Don't worry."

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

"You all wait here for me, I'll be right back."

After Su Mo finished speaking, he directly climbed into the mecha, and then controlled the Black Steel Envoy to leave.

Leaving only Sun Duoxiang and the others looking at each other, but they still trusted Su Mo very much. Since Su Mo told them to wait, they would obediently wait here.

After a long time, Su Mo drove the Black Steel Envoy back to that fallen city again.

As always, there were numerous zombies wandering around everywhere. After hearing the noise, they were attracted and rushed towards Su Mo frantically.

Unfortunately, Su Mo directly ignored them. The heavy Black Steel Envoy mecha was like a bulldozer, directly crushing them and stomping them into meat sauce with its feet.

Of course, these zombies weren't completely useless; at least they could get the exterior of the Black Steel Apostle mecha dirty.

Relying on his memory, Su Mo walked towards the area where he was chased by Dandan. Although so much time had passed, she might still be active in that area.

Now Su Mo wasn't worried about finding her. As long as she was still in this city, finding her was only a matter of time.

The biggest fear was that she had been killed by other players and the thing had been taken away by others, then there would be no way.