Lena continued to drive the airship, which was currently considered a submarine, and with the help of electricity, there were much fewer obstacles to its way.

But as time went on, the two of us became more and more lost, because there really seemed to be nothing in the river except the endless river and the countless ugly mermaids.

"What do you say these things eat? In such large quantities, can you eat the same kind of food?" I asked.

"I guess there are other creatures. Lena said.

"But along the way, we didn't see anything but the ugly mermaid. I said.

"With such a large number of ugly mermaids dispatched at the same time, how could other creatures dare to appear. Lena said.

"Well, how far have we come?" I asked.

"I've traveled hundreds of kilometres. Lena said.

"How long is this river, why can't it go to the end. I asked, surprised.

"Why don't we go back. Lena said.

"It's been so long, let's look back. I said.

Although the ugly mermaids around me didn't give up attacking us, I still didn't plan to give up so easily, because I always felt that there must be something strange in this, even if it wasn't the Beast Crown, it was something else.

We drove another 100 kilometers, and just as Lena was about to turn back, the echo sonde finally spotted land.

"Ready for liftoff. Lena said excitedly.

"Be careful. I said.

Seeing the submarine jump out of the water and back into the air, the ugly mermaids in the river became even more irritable, and jumped out of the water and slammed into us, especially the big tail, which hit us several times and almost hit the rock wall.

At this point, I finally saw the land in front of me, and I finally figured out where the ugly mermaids came from.

The land in front of you is beautiful, and you can't see the exit, but the sun is shining, and when you look up, you can see that there are many crystal walls on the top of the cave similar to the one on the small waterfall.

The land is so large that you can't see the end at all, and the land is covered with a variety of vegetation that grows so densely that it's a huge rainforest.

While Lena and I were in a daze, the hull of the ship was hit hard by several more ugly mermaids.

"Fly forward, this thing is dead. I said to Lena.

"Hmm. Lena said as she flew at full speed over the land in front of her.

Now that we're out of range of the ugly merfolk, we're patrolling the rainforest.

After walking a distance, I began to see all kinds of animals, some of which were even more bizarre than what I had seen on the island before.

It's not that it's ugly, it's mainly that it's weird, pigs with horns, birds without wings, and I've seen animals that look like dogs and cats.

I didn't see any particularly large creatures, but I didn't see any water sources along the way.

"Is that the river the only source of water here?" I said.

"Possibly, this explains that the ugly merfolk eat from animals that fight to drink. Lena said.

The further you go, the more sparse the vegetation becomes, but the rainforest is definitely more than a thousand square kilometres.

Because we can fly much faster in the air than in the water, and now that it's getting dark, we've been flying for three or four hours.

"I didn't expect there to be a place like this. I said.

"Shall we go down then?" asked Lena.

"Go, keep going. I said.

"Well, I'm curious now. Lena said as she picked up her speed.

Under the light of the airship, I could see the land below, which was now full of desert, and there was no living creature along the way, except for a few plants that didn't need much water.

But maybe it was hiding in the sand, so we didn't land in a hurry, but kept flying.

After flying again, I seemed to see a huge building not far away, and I got closer, and I was quite surprised by the shape of this building.

Although I haven't seen it with my own eyes, after all, I've seen a lot of it in TV and movies, and I know the name of this thing, Pyramid.

"How can there be pyramids in this place?" I asked, puzzled

"And it's built at the end of this land, it seems that aliens have come to this place before, let's be careful. Lena said.

"Aliens, you mean the pyramids were built by aliens?" I asked.

"Well, before our planet was lost, our people used to deal with them, and this is what I have seen in ancient texts. Lena said.

"What's their temperament?" I asked.

"I can't say, it's a bit varied. Lena said.

"Do you think there's any living creature in this place?" I asked.

"That's what I'm worried about. Lena said.

"But I haven't seen any traces of human activity along the way, it looks like my enemy isn't here, and the Beast Crown is probably not there, or we'd better go back." I said.

"That's not good, I'm curious now, if there really are living creatures, I want to ask about some things about our planet. Lena said as she took direct control of the airship and began to land.

The back of the pyramid is already the end of the land, and this huge pyramid looks down on the land like a guardian.

Standing on the ground, this pyramid is even bigger, and our airship is not as big as a stone.

In front of you is the entrance to the pyramid, a huge stone gate carved with strange patterns.

"This door has to be ten meters high, right? Do you think the two of us can push it open?" I asked, looking at Lena.

"Let's take a look. Lena said as she walked forward.

Anyway, I have palpitations right now, and just looking at the gate makes me feel a little uneasy, what a big creature this is, and it needs such a gate.

"Let's go. Lena shouted back.

"Oh. "I hurried after him.

"What, are you scared?" asked Lina with a smile.

"If there were living creatures in such a large door, how big would it be?" I asked.

"Haha, can't it just be for the sake of grandeur?" said Lina with a smile.

Thinking that this girl's ancestors had dealt with these aliens, and this girl must have known the size of these aliens, my worries seemed a little unnecessary.

Without any more thoughts, I quickened my pace with Lena to the great stone door, and we realized that there was a gap between the two doors, and it was enough for us to get through.

Lena looked at me, turned on the lights and walked in without waiting for me to speak, and I had to follow with the lights on my shoulders.

As soon as I entered, there was nothing that struck me, it was just a stone room, and the surrounding walls were full of various reliefs, and there were three steps twenty or thirty meters in front of it.

In front of the stairs is a stone gate, and on each side of the staircase there is a stone pillar more than half a person high, and there is a stone basin on top of the stone pillar, which looks like an ancient ignition lighting device.

"Is this alien technology so backward? and firelight?" I asked.

"Don't talk nonsense. Lena whispered as she turned around.

However, I guessed the purpose of this stone pillar correctly, because Lena had already ignited one of them with a spiritual element.

"It looks like it's been a few years old, how can it still be lit?" I asked, surprised.

"That's technology. Lena said with a smile.

However, Lena only lit one, and she must have wondered if she could still light it, because when it came to lighting, this fire must be more than many of the lighting equipment on our shoulders.

In fact, the helmet extended by the headset comes with its own night vision function, but in such a strange place, visible light is more secure.

Lena walked quickly, and I didn't worry about any mechanism in this place, so I naturally couldn't stand stupidly.

The two soon came to the stone gate, but the stone gate in front of them shrank a lot, only more than three meters high.

We pushed open the stone door in front of us, and the scene in front of us completely shocked me.

A huge golden palace, as if everything was made of gold, was nothing, because the clearing in front of him was full of gold and silver treasures.

On the throne at the end of the palace, there is also a golden statue with a crown on its head and looking ahead, looking like it was the former owner of the place.

There are also roads around the palace that are constantly spiraling upwards, and the whole palace is illuminated by our lighting equipment, which is really resplendent in gold.

"I think I know where the ugly mermaid came from. I said with a smile.