Azur Lane Mobile Front.

Because they also had to take care of Shimakaze, everyone chose to fly at low altitude.

Beneath their feet, a waterway led directly from the outer perimeter to the central castle, without even a single sluice gate along the way.

"It's like having a door wide open, waiting for people to come in..."

Colombia took over the conversation, still chewing gum.

"Do you think this might be some kind of activation device for the Mirror Sea?"

While instructing Helena to maintain contact with Rob in the rear, Cleveland circled twice in the sky before landing back in the same spot.

"Hmm...it's not impossible."

Anyway, everyone should be careful.

As the group slowly moved forward, they finally arrived at the inner ring.

The castle, located in the center, can now be fully seen.

Its magnificent and resplendent appearance makes it hard to associate this place with a Siren facility.

However, given that this place was likely mainly built by Akagi, it's understandable that it looks different from the outside.

As the group crossed the boundary of the inner ring, something inside the castle suddenly came to life.

Something seemed to have been activated.

Immediately afterwards, without warning, the entire sea area began to tremble.

"!!!"

"What happened?!"

The group, who had just landed on the inner ring road and were planning to take a good look around, were caught off guard by this sudden situation.

However, before anyone could react, a tremendous tremor instantly swept through the entire castle.

"Cleveland, you must retreat immediately! I can see the entire Dragon Palace sinking!"

Amid the vibrations, Rob's voice came through the communicator.

Cleveland tried to grab the communicator, but the violent vibrations made it impossible for her to maintain her balance for a while.

At this moment, a light blue barrier slowly appeared around the Dragon Palace.

This barrier, like a pale blue dome, covered the entire Dragon Palace Castle, while also isolating it from the outside seawater.

Finally, amidst violent tremors, the entire Dragon Palace slowly sank underwater.

Chapter 298: An Unexpected Person

After a prolonged and violent shaking, the Dragon Palace finally stopped sinking.

"Sigh~"

On the inner ring, dizzy and disoriented ships lay scattered all over the ground.

Shimakaze's situation was even worse; she was lying face down on the water.

Fortunately, the ships' excellent physical condition allowed them to recover from the dizziness quickly.

"Oh no... this is terrible..."

As soon as Cleveland recovered, he immediately flew into the sky to check on the current situation.

The surrounding area was completely filled with seawater, and a barrier isolated the Dragon Palace from the outside world.

Looking up, there wasn't a single ray of light to be seen, indicating that we were already quite deep inside.

"Ah, thankfully this barrier is sturdy enough, otherwise it would have been a real problem."

"Cleveland, how's the situation there?"

"Ah, we're alright here. This barrier is blocking the seawater. There's no major problem for now."

Thanks to the enhanced communicator provided by the system, communication remains smooth even at this depth, although there is some noise, but it is not a major problem.

Because of the massive vortex caused by the sinking of Ryugu Castle, Robo's troops had to retreat a considerable distance.

Given the current situation, it's difficult for Rob to take appropriate measures without understanding the specific circumstances.

"center."

"At the heart of the Dragon Palace lies a mystery and a treasure."

"The path back will be opened at the center of Dragon Palace City."

"Travelers who have arrived here, break through the barriers and proceed straight ahead!"

"The heart of the Dragon Palace will prepare the reward that the hero deserves."

Without warning, a mysterious sound suddenly came from somewhere.

Robb, who was on the phone with Cleveland, also heard the voice at the same time.

"This is..."

Everyone froze in place.

"Cleveland, what's that sound over there?"

"I don't know either, Commander. It just came out suddenly. It seems to be coming from the castle."

This voice seemed to offer the people trapped in the Dragon Palace a way to escape.

However, this is on the premise that the owner of the voice has no malicious intent.

"First, tell everyone not to act rashly. I'll discuss this with you."

When it came to the safety of his own girls, Luo Bo dared not make a hasty judgment.

Cleveland and her friends are now trapped at an unknown depth in the ocean, making rescue extremely difficult.

Even if they could forcefully break through the barrier and rush out, the water pressure at the bottom of the sea would give them a good thrashing.

While Rob and Zhenhai were discussing countermeasures, several unexpected figures were also watching Cleveland and her group from the depths of Dragon Palace.

"Seriously, Lord Eugen, those lines were so embarrassing!"

Having just finished reciting his lines, Z2, his face flushed, vented his dissatisfaction to his boss.

"Oh, what does it matter?"

"Isn't this quite interesting? Hehe~"

Eugen flicked Z2's forehead and burst into laughter.

However, the moment she opened her mouth, Z2's face immediately fell.

"Lord Eugen, you've been drinking again!"

"Hahaha~"

Clearly, Eugen, who had drunk quite a bit, was no longer going to pretend and laughed, ignoring his duties as an adjutant.

"Hiccup, but this time there was an unexpected bonus. It turns out that the fleet from the Eastern Empire has come."

Although her face was flushed, Eugen's eyes remained clear as she looked towards the outskirts of the Dragon Palace.

Ironblood's plan has reached its final stage, and the biggest surprise is from the Eastern Empire.

Frederick the Great's top priority was to bring the commander from the Eastern Empire along as well.

After all, judging from intelligence from various sources, that commander was extremely interested in fighting the Sirens.

...

After some discussion, Rob ultimately decided to let Cleveland and the others explore the center of Ryugu Castle first.

The reason is simple: if that voice really wanted to harm Cleveland and the others, it wouldn't have gone to such lengths.

Simply remove the barrier, and you're done.

After receiving instructions from Rob, the expedition team prepared to set off again.

"So, the exploration of Dragon Palace can continue now?"

Completely oblivious to any sense of crisis, Shimakaze was filled with enthusiasm as the adventure continued.

Seeing her impatient look, even Shigure, who was usually very boisterous, couldn't help but sigh.

"That towering building is probably the control tower here, right?"

"Maybe what that voice said was right?"

Looking ahead, Cleveland began to plan the operation.

As the team leader, she was responsible for the safety of her team members.

"Everyone, move towards the center."

"Remember, don't act rashly, and report any situation immediately!"

Cleveland emphasized the mention of a certain rabbit.

"Oh!"

Amidst the excited cheers of the island wind, the entire team embarked on another adventure.

...

Following the waterway, the group passed through the inner ring area and slowly made their way towards the central castle.

"It feels like this place has been abandoned for a long time."

As they moved forward, the group observed their surroundings.

I hadn't noticed it before, but now that I look at it, the sense of abandonment and decay is becoming more and more obvious.

"Um... has anyone else noticed that it seems like the wind has picked up here?"

"???"

Helena's words stunned everyone.

For no other reason than that, underwater, with barriers in place, it's simply absurd for the wind to rise.

"The wind in the island can feel it too; the waves beneath our feet seem to have become more pronounced."

Shimakaze's addition made Helena's words seem more credible.

Although it was outrageous, everyone had no choice but to react immediately.

"Denver, take the Shimakaze with you, we'll go over there by air."

Since none of these are normal ships anymore, Cleveland isn't going to use any normal approach to handle things.

Based on the mysterious sound just now, the waves are probably some kind of mechanism or something.

However, for those of us who can fly, the waves are really no problem.

"Wow! The shimakaze is flying!"

Shimakaze, lifted into the sky by Denver, seemed unusually excited. At the same time, her rabbit ears kept swaying in front of Denver, making him feel uneasy.

(Ah~ I really want to pinch it...)

As the waves became more pronounced, two rows of mass-produced sirens emerged from the water on either side of the channel.

Unlike those encountered before, these sirens moved slowly and sluggishly, but seemed to be incredibly heavy.

The waves crashed against the sirens, yet they showed no reaction whatsoever.

Clearly, these sirens are there as a mechanism for clearing levels.

However, for Cleveland and her group, these were clearly unnecessary.

Adhering to the principle of not missing any opportunities, the group destroyed the Sirens with a wave of their hands.

...

"Oh my, this is such a...surprise..."

Prince Eugen, who had been observing Cleveland and the others, was somewhat amused and exasperated by the scene before him.

"Looks like my appearance time will have to be brought forward."

"Let's go, Odin!"