Chapter 203 040: The Undersea World

After walking in the cave for more than 20 minutes, there appeared in front of us

"Eh? Is that light?"

Nicole pointed to the front and saw that there seemed to be light on the other side of the cave, which was particularly eye-catching in this dark seabed.

Green nodded: "Yes, the exit is here."

After a pause, he pointed to the lantern in Luo Xi's hand and said: "The lantern can be extinguished."

The two tidal sirens in front had also extinguished the tridents in their hands.

Seeing this, Luo Xi turned off the magic lantern and returned it to Green in front of him.

Continue to move forward, after walking along the cave for a few minutes, the light source in front became more and more sufficient, and the original darkness was gradually dispelled. When it was about 100 meters close to the cave, the light here was already very sufficient, and the texture on the surrounding stone walls could be seen clearly.

If it weren't still floating in the air and able to feel the flow of sea water, Luo Xi would even mistakenly think that he was in an ordinary cave.

One hundred steps

Fifty steps.

Ten steps

Soon, Luo Xi walked out of the cave, and then, a very unique underwater world was revealed in front of Luo Xi.

This is a very magical mountain.

The knee-high emerald green water grass bloomed all over the land, which looked like a very fertile grassland, making people just want to lie down comfortably and have a good sleep.

Next to the lawn is a coral group, where colorful corals gathered together in a large area. The small ones are only the size of a palm, and the large ones are more than one person tall, which looks like a special stone beach.

All kinds of strange fish, crabs, and shrimps swim freely among the corals, relaxed and free.

Nicole was dazzled and mysterious: "It's so beautiful here, Luo Xi."

Luo Xi nodded: "Indeed."

While talking, he turned his head and looked around. Nicole couldn't help wondering: "What are you looking at?"

Luo Xi explained: "I'm looking for the light source. Where does the light here come from?"

And soon, he found the answer.

It's jellyfish.

There are many water plants and tiny planktons swimming in the water here. These things will release light sources, and it is the kind of white light that spreads widely. When they are connected, the light source here will fill every corner, making this place the same as the outside world.

Green came over: "These are light fish. They are the light sources in the sea, and their work and rest are the same as the outside world. Every night they will hide in the coral group to live, and the light source will dim. Only some tiny plankton will glow, and then it will become like the night outside."

"Those tiny mayflies will also gather in the valley at the top. When the light fish are extinguished, they look like the galaxy we see at night."

Luo Xi exclaimed: "It's really a magical underwater world."

Originally, he thought that he had mastered a lot of knowledge, but it was the first time he heard of what Green said.

Green nodded: "This world is very big. The underground, the seabed, the sky, and the land, each of the four worlds has its own wonders. Even for us wizards, we only know a little bit about the world."

He had seen this sentence in a book before, but now he can really appreciate its meaning.

Green continued: "We are almost there. The gathering place of tidal sirens is in front of us."

He raised his hand and pointed forward.

Roshi looked in the direction of his finger. It was in a valley in front of him. The valley was surrounded by a group of corals. There was even a lake in it. Next to the lake, there stood a towering castle.

Nicole was surprised and said: "Castle? Tidal sirens also know this?"

Roshi was also very surprised. After all, as far as he knew, the sea people were not very good at sophisticated construction techniques. Buildings like castles should be unique to land creatures.

Green explained: "This castle was not built by the sea people here, but by a wizard in the past."

"That was a high-level wizard who built this castle here for long-term observation because he was doing some research on underwater creatures. Later, the wizard left here after the research was completed, and this castle was given as a gift to the tidal sirens who cooperated with him in the research and investigation."

Luo Xi suddenly realized: "So that's it."

"Okay, let's go over there quickly."

It's really a wonderful feeling to travel on the seabed. With the help of the compound interest effect, each step can easily jump out more than ten meters, and can also float in the air at any time, just like a bird, flying towards the destination.

Soon, Luo Xi and his party came to this valley.

At this time, Luo Xi discovered another strange thing. There was actually a lake in this valley.

It's not surprising to have a lake on land, but this is the seabed, and they are completely in the water. However, it is really surprising that there is a lake in such a place.

Luo Xi asked curiously, "Is this a lake?"

Green nodded, then smiled mysteriously, "You will know if you touch the water surface with your hand."

Luo Xi then reached out and touched the water surface.

And at the moment when his hand touched the water, he immediately felt that the water in the lake here was unusual. The water seemed very heavy. It didn't feel like water in his hand, but like a piece of big stone.

Luo Xi was surprised and said, "Is this heavy water?"

Heavy water is a strange substance in this world. Its density is much greater than that of ordinary water, so it is also much heavier than ordinary water.

Green nodded: "Yes, it is heavy water."

Luo Xi looked at the water in his hand and couldn't help frowning: "Can I take some away later?"

Heavy water is also a very rare substance. Luo Xi had only seen it in books before. Taking this opportunity, he also wanted to take some up to do research.

Green asked the two tidal sirens for advice, and the latter nodded very readily.

In fact, the lake here has a special meaning for the tidal sirens living here. It is regarded as their holy lake. Generally, outsiders are not allowed to approach it easily, let alone take away the water here.

However, Luo Xi had helped them drive away the deep-sea giant whale before, and as a thank you, the tidal sirens agreed to Luo Xi's request.

Luo Xi then took out a container to collect a few small tubes of heavy water and thanked the tidal sirens.

After collecting the heavy water, the group set off again, and this time they finally arrived at the destination of their journey, which was the castle standing in the valley.