"Then we'll use the orcas."

"Yes, that's a good idea."

Since its creation, has had little to do.

It seems that it's finally time to use it here.

"Well, let's give it a once-over, shall we?

I'll help you.

"Me too."

When Jin got up from his seat, Marcia and Rodrigo came forward as well.

Jin thought that if anyone had an interest in boats, it would be these two.

* * * * * * * * * * * *

Jin moved to the dock at Tatsumi Bay.

Accompanying him were Reiko, Marcia, Rodrigo, and Marikka.

It's been a long time since I've been here.

"Yes, it has. Marcia and Rodrigo are often here, but Marikka doesn't come often.

<.

The is pulled out of the seawater, washed with fresh water, dried, and stored in the dock when not in use.

The surface is treated, but if left unattended, barnacles and seaweeds adhere to it.

"Oh, I wonder if that's why the submarines at were made of orichalcone."

Orihalcon is a copper-based alloy. Jin thought that it would be effective since many organisms do not like copper ions.

In fact, toxic paints were also used for a while on ships on Earth to prevent increased drag due to barnacles and algae.

Barnacles on the screws create a large resistance and lead to a reduction in speed.

Of course, deposits on the bottom of the ship are also disliked because they increase drag.

The Horaijima fleet, which is left afloat, is cleaned regularly by the <.

Sometimes edible shellfish such as oysters are harvested. ...... This is an aside.

"The outer shell of an orca is the shell of a gigantopod. You can scrape it off with a steel spatula, or wash it with strong acid or strong alkali.

However, engineering magic <> will do most of the work.

Now it sits on the barge in a dry state.

"This guy's really something, isn't he?"

"Well, I can sense your sense of style, Jin.

"I'm embarrassed beyond embarrassment when you say so.

The original design of the Orca was based on a submarine from a special effects puppet show about a great undersea war that Jin saw when he was in modern Japan.

The reason why Jin knows this is because he had seen a box of the plastic model at a toy store he was familiar with.

It was a very old plastic model with a premium, so Jin, who could not buy it even if he wanted to, memorized the design and became enthusiastic to build it himself after returning to the facility.

This design exists here in the world as .

Of course, they are not exactly the same. But at a glance, the impression is quite similar.

"The world where Jin lived has advanced in many ways, hasn't it?"

Marcia sounded impressed.

"No, I mean it was advanced. ......"

Jin thought that it might have been advanced in terms of fantasizing and giving shape to images.

In special effects dramas and animated cartoons, vehicles with amazing-looking designs have been appearing one after another.

These vehicles were designed with aerodynamics and functionality in mind.

"Well, it's in good condition."

The < have been checking and maintaining the cars regularly, so they were in as good condition as new.

"The only thing I need to tinker with is the Magni Reactor."

The efficiency of the <, which is the power source, has been further improved between the time when < was made and now.

Therefore, Jin exchanges it for the latest model Magi Reactor.

But the main thing is to install a remote control system.

The old man will be able to control it directly.

"We can't lose this one!"

Even though it is a mock battle, if we lose this time, we will have more troubles later on.

< under my control.

"Engineering magic is a good thing, isn't it?"

"What is it, Marcia?"

Marcia said sincerely as Jin checked the interior connections.

"Well, I've known ships that have used engineering magic and ships that haven't."

"Yes.

"Engineering magic is very sneaky, isn't it? I mean that in a good way, you know?

"I know."

What Marcia means by "cunning" in a positive sense is that it is a superior method that cannot be imitated by any other method.

For example, joints.

For example, wood can be joined by nails, screws, gluing, or a combination of these methods, while metal can be joined by rivets, screws, brazing, or welding.

However, when we use the engineering magic <, we can make a homogeneous joint.

Even on modern Earth, joint strength loss is an engineering challenge, so Marcia's temptation to say <> was understandable.

"Well, you know, ...... I think it's certainly not fair to say that you don't have to weld."

Although welding is much stronger and more reliable than riveting or bolt and nut fastening, there is a major problem of <>.

This causes thermal deformation of the base material and, in the case of steel-based materials, tempering, which reduces the strength of the weld.

In the case of a submarine, it is said that when the submarine is crushed by the crushing ...... water pressure, it is from the joints.

The engineering magic that does not cause any such risk is still a "cheat".

"Okay, that's it. No problem."

"Father, the hull distortion is less than plus or minus 0.001 percent, no problem."

Jin and Reiko have completed the final checks.

Marikka is in charge of the communication function.

It is Marikka's turn to make the magic brain that controls the communication function.

In this way, when communicating with the Jigosaldo East base, we can prove that this belongs to Marikka.

"This time, even though it's a simulation, it's for combat purposes. Let's operate it unmanned."

"What about the main weapon?"

Marcia asked.

"Well, that's the problem. We don't want to completely destroy it. ......"

"I agree. They will probably analyze this defeat and take countermeasures.

Rodrigo also weighed in.

"Then what should we do? ......"

Marikka tilted her head and looked at Jin.

Jin gave his opinion.

"I think we should think about how we want to win and choose the right weapon for it.

"You can't use the same ...... as before, can you?"

"Yeah. They will probably take countermeasures.

Thus, Jin and the others decided to plan a strategy first.