"Actually, I learned about this principle before. When the outside and inside form a pressure difference, this swamp, whether it floods the cave entrance or not, still won't flow inside. That's because there's a relatively high pressure inside the cave, creating a vacuum layer over that area."

"So, as long as this function exists, then it might help us get to another underground cave, and this cave is hidden beneath this island?"

"Yes, that's exactly what it means. Since this place can have such a peculiar swamp, I think when people hid here, someone must have discovered this long ago. So, they took advantage of it, hiding people under this cave, and just like that, for decades, probably no one would ever find out."

"If that's the case, it is indeed a great hiding place, but I'm not sure if this situation can actually become a reality?"

"I don't know, anyway, we are moving in a positive direction. Next, don't think about anything. Today, we'll carefully search here during the day to see if there's anywhere we can actively explore."

Upon hearing this, Lin Yaru stopped the thought because she knew that saying more now would put too much pressure on the others.

To be honest, Lin Yaru didn't want to proceed like this at the time. After all, she still had to rely on the two of them for everything.

The group wandered aimlessly around the jungle,

and every time they passed through an area, Anying habitually marked it, so by now, they had covered about two-thirds of this jungle.

"See? It's that same place again."

After circling around, Anying pointed at the two already-marked trees ahead and said to them.

"Yeah, we clearly headed west from there, but unexpectedly, we've returned here. This place is really like a maze. If that's the case, when we try to find the boat's location, will we also get lost?"

"How could that happen? I've already installed a GPS module on the boat. So we just follow the GPS guidance, and it sets a path for us. We definitely won't deviate."

"That's good, but shouldn't you confirm whether we can use this GPS module to identify other directions?"

"Ah, it seems I really overlooked that. Just a moment, let me check now."

As he spoke, Anying stopped, looked for a quiet spot, and the three of them sat down on the ground.

They had been walking intermittently for about two or three hours, and now they were indeed starting to feel a bit tired.

"Alright, let me check the surrounding paths. Meanwhile, there's some functional drinks left in the bag, though not much, along with some dry food and some energy boosters. You guys take them out and eat a little."

Anying tossed his portable backpack onto the ground beside them as he spoke.

Ye Chen walked over, took out the contents, and gestured to Lin Yaru, who simply shook her head gently.

"I'm not hungry, can't eat anything at all. Just bring me the water. I'm feeling a bit thirsty now, so let me have some water first."

Ye Chen nodded, drinking water would suffice for now, but eating might be hard for anyone right now.

"Ah, it's really strange."

At this moment, Anying suddenly muttered, making Ye Chen quickly turn to look.

"What's wrong? Is there a problem?"

"Has the GPS module diverged again?"

"No way, you said earlier that it wasn't accurate, but when I checked, it seemed accurate enough. Why, have you found issues with locating the boat?"

"Yeah, it was right here, roughly 6 or 7 kilometers away. But when I opened the program just now, it showed that it had somehow ended up in the ocean?"

"What? In the ocean? That's impossible, right?"

Upon hearing this, Ye Chen grew alert and hurried over to Anying's computer monitor.

"Indeed, their current location can still be pinpointed, but the GPS module-equipped boat is now almost 40 kilometers away from them."

"According to the map measurement, it shows 40, meaning we're indeed about 40 kilometers away now, right?"

"Yes, it really is 40 kilometers, and do you see? It's still drifting continuously."

"Hold on, why is it still moving here? Also, check if the sea winds and currents are moving in the same direction as the GPS module?"

Anying suddenly realized something was wrong, so she examined it closely and analyzed it.

"You're right, I suspect this boat has already left the island."

"What happened? Didn't we properly secure everything before? We even fixed the boat in place, so how did it leave?"

"I'm not sure. Normally, without interference, the boat wouldn't leave the island at all."

"Are you suggesting someone deliberately set the boat adrift?"

"Exactly, that's highly likely."

"Then who would have done this?"

"I have no idea, but what I can confirm now is that the boat has left the island, which means we can't return to the mainland by boat anymore."