He Yu and Jia He around him will also ensure that he does not touch any part of this underground passage.
The clock tower has a long spiral staircase leading underground.
After about five or six laps, Zi Sui finally reached the end.
The underground space is very spacious, but it lacks the exquisite luxury of the interior of the clock tower above.
There was only a relatively flat stone wall and a thick door carved with intricate array patterns.
The secret hidden by the Third Research Institute is probably behind the door.
Zi Sui just glanced at the door and walked towards it.
There was no need for any troublesome keys or decryption, just a light swipe of He Yu beside him.
The next moment, a space wormhole appeared, and the world behind the door was on the other side.
Leaving enough anchor points, Zi Sui took a step forward, the wormhole collapsed and closed, and he had arrived on the other side of the door.
There is no lighting in the passage on this side, but there is a faint light coming from the depths of the cave.
With this little light, Zi Sui with his bright eyes could see things easily.
Naturally, he could also observe the difference between the passage here and outside the door.
The rock walls here are obviously uncarved, rough and irregularly pitted.
Looking closely, it seems to be a rock with red or brown color.
Zi Sui felt that these rocks looked somewhat familiar.
He continued to go inside while scrolling through his memories in his mind.
The further inward you go, the higher the temperature in the passage.
At a certain moment, Zi Sui's nose suddenly smelled the smell of rotten eggs.
The smell reminded Zi Sui, and he immediately remembered where he had last seen that kind of rock.
The volcano is located at the foot of an active volcano that has not erupted for a long time.
Those rocks are clearly magma flows that have been oxidized after being exposed to the air for a long time.
As for the increasingly strong and pungent smell of rotten eggs, it is the smell of sulfur.
Zi Sui was moving deeper into the tunnel at a fairly fast speed, so his idea was soon confirmed.
At the end of the passage, there is another door. Through the metal fence on the door, you can see a large amount of surging magma.
And the prisoners bound by iron chains on the lava.
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