"So, can you detect the source of that energy?" Captain Mu asked.

"Well, the detector has a little bit of a reaction. Yes, a little deeper. ”

The two moved on. Time was running out, and they were moving rapidly through the cavern by the light of Yunjira.

"Dr. Shin, do you feel ...... Here......"

"Like you're wrapped in something?"

Captain Mu said.

"Huh?" Mr. Xin was a little strange.

"This is in a cave...... The bread outside must be something like a rock wall, right? ”

"No, it's not." Captain Mu shook his head.

"We, the Einsatzgruppen, have found the original stone of the Fire Stone in the volcano. That's why I often go out and out of the volcano with my teammates. ”

"Here, this circle around this ruin, always feels familiar to me."

"As if...... It's like, the rock walls of a volcano. ”

Captain Mu said his guess.

"Volcano?"

Mr. Xin was stunned. "You mean, this is a city built in a caldera?"

"Hmm...... It's really possible. If that's the case, maybe that's why the ruins still exist, rather than being buried......"

"Because it was built in a volcanic crater, when it was buried under the sea, the original crater formed a hollow cavern, and everything here was preserved......

"It's just that what has happened and how long it will take for a city to be buried tens of thousands of meters under the sea......"

Mr. Xin frowned and thought.

"Let's go!" The sucker puppet suddenly screamed.

"What? Well? The detector has a reaction? Mr. Xin was shocked.

"Captain Mu, please go in that direction!"

"Got it. Wind Speed Dog! ”

Captain Mu immediately adjusted the direction, and the wind speed dog flew quickly, rushing towards the place where the detector detected the reaction.

In the blink of an eye, the two were at the edge of the cave.

Mr. Xin looked puzzled: "Isn't this an ordinary rock wall...... Could it be that the anomalous energy is inside the rock wall? ”

The two of them didn't have much time, how could they dig such a solid rock wall......

"Wind Speed Dog, did you find anything?"

Wind speed dogs sniff and sniff on the rock wall. Captain Mu immediately realized the abnormality.

"Wang!

”

Sensing Wind Speed Dog's inquiry, Captain Mu nodded to Wind Speed Dog. With the trainer's approval, the wind speed dog turned his head directly at a rock wall, and then sprayed flames out reluctantly!

"This ...... Where is it? ”

The flames burned down a layer of floating earth. The true face of the rock wall is revealed.

"This ...... It's ......"

"The gate of the rock?"

Captain Mu was shocked again.

"Judging by the location, this should be on the volcanic wall."

Mr. Xin looked around.

"This is supposed to be a 'ruin' hidden in the mountain wall. Maybe it was built by someone in the city, or maybe it was even earlier than that city......"

He tried to push the door hard, but the rock gate trembled slightly, and a lot of fine sand fell.

"Looks like it can be opened directly...... Let's go inside and have a look! ”

The two of them pushed open the door together, and inside was a small stone room. In the stone chamber, a stone slab was quietly embedded in the wall facing the door.

"There it is! That's it. Mr. Xin said in surprise.

"That energy, it should be this slate."

As he spoke, he wanted to step forward and pry the slate off.

"Wait, Dr. Shin!" Captain Mu grabbed the excited Mr. Xin.

"What's ......?"

Mr. Xin was stunned. Only then did he notice that the sucker puppet beside him looked uneasy. The wind speed dog beside Captain Mu also lay on the ground and purred alertly.

"Here? At risk? How can there be a bioenergetic ......"

Before Mr. Xin could finish speaking, he only heard the sound of something cracking in "Kacha", which suddenly came into his ears.

"Is it ice? What's ......."

A few people looked above the voice, but they only had time to see a red light, and then there was a loud roar.

"Roar!

！

”

"That'...... That red light is! ”

Captain Mu was shocked inexplicably.

But there was no time for her to think about it. A huge body stood in front of the stone slab, and then there was a monstrous wave.

"This ...... What a skill this is!

！ ”

The big wave directly swept the two out of the stone room, and Captain Mu saw that in the huge wave, a blue elf with two long sharp teeth tightly bit the wind speed dog washed by the big wave.

"What kind of elf is this!"

Being in the deep sea, the illustrated book could not connect to Dr. Mu's database, and Captain Mu naturally didn't know what this elf was.

If Lin Yu was here, he would be able to tell her that this was the spirit of the water and ice systems, the Emperor Tooth Sea Lion]!

"Wind Speed Dog!"

After eating a trick of "surfing", he was directly attacked by the frozen teeth, and the wind speed dog was already dying. Captain Mu finally stabilized his body and quickly took out another Poke Ball.

"Please! Raidemon! ”

"Roar!"

A majestic canine-like elf appeared in the red light. Unlike Lin Yu's caller, this thunderbolt beast is a majestic large canine that looks more calm and reliable.

"Raidimon! Thunder! ”

"Roar!

！ ”

Captain Mu directly used all his strength, and the thunder beast roared, and the abundant electric energy condensed into a violent thunderbolt, and crackled towards the Emperor Tooth Sea Lion.

Taking advantage of the fact that the Diya Sea Lion was hit by thunder, Captain Mu rolled and put the wind speed dog into the ball.

However, the thunder dissipated, and the Emperor Tooth Sea Lion actually condensed a thick wall of ice, blocking the full force of the Thunderbolt Beast's blow!

"How...... How can it be! ”

Captain Mu panicked. Her Thunderbolt Beast has also been carefully cultivated, and she can't say that she is stronger than the elves of the Little Feather Pavilion Master, but compared to all the other trainers, she is still very confident.

However, it was easily blocked by this elf!

"This elf...... It's amazing!

”

In terms of strength, it is definitely the top of all opponents!

Facing this elf, in a flash, Captain Mu had the feeling of facing Lin Yu's level opponent.

"Uh-huh...... It's hard to entangle......" Captain Mu's forehead broke out in cold sweat.

This elf is so powerful, let alone defeat him. As long as it delays for a while and misses the time, then he and Dr. Xin who are trapped in the depths of the ocean will definitely die.

"And...... I don't know where Dr. Xin went......"

"Roar!

！ ”

The Tytooth Sea Lion roared again. This time, a terrible cold wind blew in the audience.

The blizzard mixed with the blizzard froze the surroundings at a speed visible to the naked eye.

"This ...... What kind of skill is this! ”

If Lin Yu is here, he can recognize that this is one of the strongest skills of the ice system, Blizzard!