The talk of preparing <> or <> magic tools for the mines was brought to <> through the old man.

"Master Tomax, I have looked into it and found that there was a time before the rise of the <> when golems replaced the workers in the mines, especially in the deeper parts. That was about 250 years ago.

Manon, the secretary-automata, reported.

"Well, then it is no wonder that the current environment is so bad.

Tomax agreed with this dark side of history.

"So, this is also supported by the deus ex machina, is it?"

"Yes. Or, to be more precise, Jin-dono too.

"Yes. If those two are cooperating with us, then we're a force of a thousand.

Since Manon's arrival, Tomax Bartmann's workload had been reduced to less than one-third of what it had been before, and he was not only able to get more sleep, but his health had also improved, allowing him to take on new ventures without problems. His stomachache, a chronic illness, had also subsided. Simone, the same type as Manon, had joined him and he was now fully capable of fulfilling his duties as Chief Superintendent.

"Tomorrow we will receive 10 units of the . They are prototypes, so please try them first and point out anything you notice.

"I see, that makes sense. Then, I will lend one unit to each of the autonomous regions in the Kingdom of Klein, Franz, Egelea, Elias, Selroa, Shoro, and the former Leonard's Kingdom for testing.

The remaining three are to be used as spares, is that correct?"

"That would be correct."

In fact, this magical device named created by Jin did not cause any particular problems.

The reason is that the old man had the data of the past use, so he used it as a reference.

Therefore, the production went very smoothly.

If any improvement is to be suggested, it would be in terms of the purification capability .......

It will take a few more days to get the test results.

* * * *

Jin and Erza had returned to Horai Island after the necessary meeting.

The date is January 10, 3901.

"I've already left the construction work over there to the contractors, so now it's time to go to the Shoro Kingdom.

"You're busy, aren't you?"

"Yes, I am. But you don't have to be bored. ......

I'll come with you this time.

I am also eager to introduce Elsa as Elsa as soon as possible.

In the Kingdom of Klein, she was called Erna, so he wanted to correct that information as soon as possible so that it would be passed on to her.

"Well, the first day will end with a meeting. Construction will start on the third day or so, right?"

He is thinking of using the for leveling the ground.

"Shall we use <> and say that we flew there for two days?"

and to the public, then? >>

"Yes, ......, but <> would be a bad idea, not <>?"

Jin thought that it was about time to show the great progress of the technology to stimulate the engineers, but he also thought that it would be a problem to step up all at once when <> were still in the process of development.

"Well, let's leave the <> out of it, and let's make a large-sized <> that can carry it.

"That might be a good idea."

Erza agrees, as there will be many opportunities to transport heavy items and large quantities of goods in the future.

"<> weighs about 8 tons. So it should be able to carry about 10 tons."

Jin is not familiar with military affairs, but the Self Defense Force's CH-47 helicopter with two rotors is said to have a payload of about 8 tons. It is said to have a payload of about 8 tons.

Therefore, it is not aerodynamically impossible.

However, it was expected to be quite large.

"Like the <>, the helicopter has four circular wings for flotation. Let's place them at the apex of a square."

<

The old man supports him and the size of the wings is decided.

"That's pretty big. ......<> will also be installed to reduce the risk of a crash."

In this way, the main specifications were also decided.

"Let's use 64 light silver to make it light and strong."

< was to be made of magi type reinforced materials so that it could support a weight of 8 tons.

The location of the construction site was considered to be the airfield behind the research institute.

Since there is no hangar that can hold an aircraft of this size, we decided to build one at the same time. In short, it is a dock and hangar.

However, Jin thinks it over here.

"But I don't want to clear too much land around the institute. ......"

< or a .

At that time, Erza, who heard Jin's soliloquy, said something interesting.

"Then why don't you build it underground?

"What?"

"There have been a lot of people who have underground bases, so I was thinking that Jin brother should do the same."

It seems that he was not obsessed with the idea of an underground base, but was thinking about it logically.

"I guess so."

There are no aircrafts that need a long runway on Bongrae Island now.

The <>, <>, and <>, which have existed since the early days, are also equipped with a >, so they are all vertical takeoff and landing planes ( VTOL).

"Then, if we have a hatch of about 50 meters square, can we make it ......?"

Jin himself is very enthusiastic about this idea, having grown up in a generation that has longed for the in tokusatsu and anime.

As expected, he can't possibly finish the whole thing in a day.

"Hmmm, what should we do?"

There are three choices.

1. extend the trip to the Shoro Kingdom. （Extend the trip to the Shoro Kingdom (for about 3 days). 2.

2. have Lao-kun proceed with the construction work while Jin and the others are in Shoro. (Because we are not going to use Daedalus right away.)

3. "For the time being, we will have a go to the Shoro Kingdom (most of the work will be done by the old man).

"Well, I guess I'll go with 1."

I have not yet informed him of the date of my trip to the Shoro Kingdom, nor have I decided on it yet.

I was thinking of the 11th, but that only makes sense because there are three 1's in a row.

We decided to go to Shoro on January 15, and now let's concentrate on the construction work here.

Jin's decision was made.

<

We will start with the underground area.

The ground around the institute is hard and strong, making it suitable for an underground base.

A space 2 kilometers long, 2 kilometers wide, and 1 kilometer deep is to be built underground, and the walls are to be reinforced with < and then further reinforced with steel.

The surface was left intact, and the underground was hollowed out.

This hole was dug with engineering magic and 10 giant golems <>, and was completed in half a day.

The soil was removed using a , so the work was quick.

The reason for making it this large is so that it can hold <> and other spaceships.

"Okay, let's put the lid on."

The above-ground part of the underground base, rather than the hole ......, will be left with the original airfield and returned to its original vegetation.

However, most of the work has been done by hollowing out the basement, so we have only a small amount of work to do.

<, there is no need for an access hatch.

Nevertheless, a hatch has been made for Jin's hobby and for emergency access to the building.

The large hatch is 100 meters square and is for large aircraft such as the <>.

The smaller hatches are for emergency use, and there are 10 human-sized hatches.

In the basement, there will be warp gates to the surface at important places.

And...

"This looks like something interesting," said Reinhard, "I can't wait to see it.

Reinhardt came in, saying.

"Jin, let me help you!"

"Yes, please."

So Reinhardt joined in the construction of the underground base.