Three days later.
The large ship quietly sailed out of the dock in Zone 3 once again.
However, this time their target was not Luo Xuan's camp, but the fortress.
The water surface near the fortress.
The fog on the water was very thick, and visibility was less than 20 meters.
Lu Yuan carefully steered the boat forward, at almost the slowest speed.
Lu Yuan observed the surroundings and felt that there should be a lot of rubble and collapsed houses in this area.
Therefore, they had to act cautiously, otherwise, if the ship were to crash into some underground ruins, it could very likely tear the bottom of the ship.
This ship was hard-won, so he had to protect it with utmost care.
The sonar was turned up to its maximum, scanning back and forth for debris in the water.
However, after probing for half an hour, Lu Yuan sensed something was amiss.
"Honey, could you bring me all the data and images from our previous voyages, as well as some information that the sonar detected back then?"
After hearing this, Xiao Shan quickly ran to the archives in the cabin and pulled out a large pile of documents.
"What's wrong? What happened?"
"I feel like this place has changed. Is there something wrong with the ground or something else?"
Xiao Shan was slightly taken aback after hearing this, and she quickly moved closer to Lu Yuan to look at the blueprints.
Although he didn't know what Lu Yuan was looking for, he had a vague feeling that something was definitely wrong.
Lu Yuan lowered the teaching level to the minimum. After confirming that there was no danger 400 meters ahead, Lu Yuan began to look for the blueprints with peace of mind.
After searching for a long time, Lu Yuan finally found a sonar data map from the voyage six months ago.
By comparing sonar data and topographic maps, Lu Yuan located their position.
After comparing the two, Lu Yuan realized that the situation had indeed changed.
"Look, the terrain here seems to have changed. These things underground have completely rotted away! There were a lot of buildings inside!"
Xiao Shan was slightly taken aback and glanced in the direction the other person was pointing, then compared it with the detection image on the computer screen.
Sure enough, the buildings above had slowly disappeared. Although their outlines still seemed to be slightly visible, they were much smaller in size and location than before.
"What's going on? Could there be something corrosive in this water?"
"I don't know, let's go and investigate first!"
After saying that, Lu Yuan neatly retrieved it from the toolbox.
Then, a basin of water was scooped out from the water near the side of the ship and tested. The test results showed that the pH value of the water source was normal.
"This is problematic! The pH level is normal, so why are these buildings corroding? Could it be that the pH level underwater is different from that above water?"
To solve this problem, Lu Yuan found two longer barrels. When he detected a deep water area, he opened the measuring cylinder, which was filled with water, and then took it out to test again.
The test results were still normal, which surprised both Lu Yuan and Xiao Shan.
"Should we use the carbon level detectors in the ship's hold to test it?"
"Hmm, it seems this is the only way to test it!"
So Lu Yuan found a longer probe, hung it on the side of the ship, placed a tube in the center, and dropped it overboard.
As it continued to move forward, the bucket kept scooping up the debris from the bottom of the water.
A few minutes later, when Lu Yuan felt that his head was almost full, he lifted the small bucket up.
The bucket was full of all sorts of debris.
Lu Yuan took a spoon and gently scraped it a few times inside.
In addition to common soil, they found various brick and concrete powders inside.
Upon seeing what was inside the bucket, Lu Yuan's eyes widened in astonishment.
"It's all turned to powder! How is that possible? Could something strange have happened underground?"
Xiao Shan, who was standing nearby, suddenly posted a message.
"By the way, we don't seem to have found any ghouls. Could it be that the ghouls disappeared along with them?"
Lu Yuan then quickly turned on the sonar to conduct a survey of the surrounding area.
By tuning the sonar to its highest frequency, it becomes possible to detect more detailed images.
After several hours of searching, Lu Yuan was unable to find any cannibals in the vicinity.
This immediately confirmed their previous assumptions.
"It seems the disappearance of the ghouls and the flooded buildings must be related to this tectonic movement! Perhaps it's a harbinger of another new disaster!"
Lu Yuan looked up at the sun, which was no bigger than an egg, hanging high in the sky, and frowned slightly.
"This is a bit strange! Let's keep going and see!"
So the two continued to steer the boat forward.
The further they went, the thicker the fog became, and Lu Yuan could no longer see the bow of the ship.
So he could only sit at the bow of the boat and walk forward.
Suddenly, Lu Yuan felt the bow of the ship hit something below.
So Lu Yuan quickly looked down.
A red, flame-like substance appeared to spread out from below the water's surface, as if someone had poured an ink bottle into the water.
Although it looked very nice, Lu Yuan still felt something was off about it.
"Go! Keep moving forward! But slow down!"
Since Lu Yuan was sitting at the bow of the boat, he had no control over it and had to let Xiao Shan steer while Lu Yuan checked the road.
After the ship continued to sail forward for several hundred meters, it finally saw the outlines of some abandoned buildings appearing in the mist in the distance.
Lu Yuan was extremely familiar with this thing.
Isn't this outline just like that eggshell-like part of the fortress?
So Lu Yuan told Xiao Shan that she could hurry up.
As the ship sped up, Lu Yuan kept looking at the buildings shrouded in mist.
Suddenly, he felt that as the boat's speed increased, the amount of that smoke-like substance on the nearby water surface was increasing.
Lu Yuan frowned slightly, unsure of what these things were, but judging from their colors, they resembled materials used in construction.
For example, red ones are bricks, gray ones are concrete, and blue ones might be the flood protection panels in the city.
Finally, the ship docked in front of the ruins of the building.
The boat stopped, and the large area of color on the water instantly dyed the surrounding water into a colorful mess, making it look incredibly vibrant.
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