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　After spending one night in the Principality of Mimaka, Jin D. immediately set out to survey the water network on the following day, July 11.

　He started with the area closest to the water source, that is, the Yato Lake side.

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　We did not stop at the nearby town of Uchidano, but went to a place where we thought the outlet, if any, would be located.

　The < is not very maneuverable, so the <> is used. The pilot is Hope.

　< is kept in the air. For security purposes, a Sky 10 has been called in as a temporary pilot.

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"Well, this is where we are: ......<>......<>......<......<......<......<......<......<......<>"

　Jin D exercises the magic of underground search in succession.

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　Incidentally, Jin D is now piloted by himself.

　Although there is a time difference problem, he really wanted to search underground here by himself.

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"As I thought, there is a bedrock at around 250 meters below the surface. There is an underground water vein above it. Above that is a permeable layer about 100 meters deep, and above that is the soil.

　This area is about 50 to 100 meters deep, so we can assume that the area was filled with soil a long time ago.

"Let's change the location."

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　We went south 10 kilometers from the site and found the same structure.

　Another 10 km to the south and the same thing.

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"Okay, let's go a little farther south this time.

　Here Jin went about 100 km south. The location is a little southeast of the town of Seadra,

"<>......<>>......<>...... Hmmm......"

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　There was not much difference in structure in that vicinity either, except that the bedrock was slightly deeper at 300 meters below ground level.



"...... mmm......"

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　Based on these results, Jin thought.

"I don't know how many years it would take if I had to do this kind of detailed research."

　Now that his hope of doing his own research had been fulfilled, Jin decided that he should do a precise investigation.

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* * * * * *

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　He handed over the control of Jin D to the old man, and Jin himself thought about what he should do.

"......I knew it, I guess. ......"

　He concluded that a three-dimensional scan would be necessary.

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"Then, we can use <> as a carrier wave from a very high altitude ......."



　Sub(sub)free-magic element(ether) wave has shorter wavelength than free-magic element(ether) wave, so it has higher penetrating power. The crust as large as that of Ars will go straight through.

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　The idea is to use them as carrier waves to investigate the structure of the earth's interior.

　In short, it is like an AM radio transmitting sound using a medium wave as a carrier wave.

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"Can we ignore the distance error from the stratosphere?"



　When scanning a wide area, the distance from the source differs between the center and the edges, and the resulting image is likely to be distorted.

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　This is similar to the case of a certificate photo or a self portrait, in which the nose appears larger and the forehead and chin appear smaller.

　As a side note, it is said that for portraits, an 85mm lens is best for a 35mm camera.

　This may not be true in today's digital age, when we have the freedom to modify the image as we wish.

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"Oh, I see."

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　Imagine a triangle with a base of 10 kilometers and a height of 20 kilometers. I imagine that it is still not enough.

"Then, how about an altitude of about 100 kilometers?"

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"Good."

　Jin decided to use the flagship here for the first time in a while. Then he would be able to observe from outer space, not to mention 100 kilometers altitude.

　And the bigger and heavier the base is, the better it is for such scanning work.

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　So, first of all, we built a <> in a rush job.



　The principle is simply to use <> as a carrier wave to release <> magic.

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　Since the control is done by a special small magic brain, the scanning speed is dozens of times faster than human operation.

　Jin built it in 20 minutes and left the installation to the < to set it up in <>.

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* * * *



　The flagship <> is not located on Ars, but on the moon.

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　Jin contacted <, the head of the administration and magic brain of the moon.



"Jin-sama, this is Jack.

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"Yes, as I just explained, I'm going to install a subterranean scanner in <>. <
Yes, sir.

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　The installation and operational test should not take more than half an hour, so Jin has nothing special to do.

"Well, who do we have here?"

　Since it's been a while since I've been out in space with , I decided to contact the members on Horai Island to see if any of the might be going with me,

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"Yes, I'm coming.




"I'm coming, sweetie."

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"I need a change of scenery."

"Sure, let's go."

Of course I'm coming.

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"If Marcia's going, I'm going too."

　Erza, Hannah, Saki, Reinhard, Marcia, and Rodrigo all said yes.

"Okay, let's go."

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　The group moves directly to via the warp gate.

"Oh, it's been a long time since I've been here!"

　Reinhardt shouts.

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　Since they travel to and from the planet by warp gate, it has been a long time since they have all been on a spaceship.



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

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　The installation of the subterranean scanner was completed, and the operation test was reported to have been completed without any problems.

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"Okay, let's go. ......<>, please."


　The giant spherical spaceship Adriana is managed and overseen by the magical brain of the Great Sage.

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　The crew consists of 1 to 500 Space Force golems <.



　The is launched from the base on the moon.

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　It heads for Ars at an acceleration of 10G. Jin and his crew decide to enjoy the short space flight.

"The stars are beautiful from space, aren't they?

"Hmm."

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　Jin and Erza were standing shoulder to shoulder in a special observation room, gazing up at the starry sky.

　The observation room is surrounded by multiple layers of wards that cut off all dangerous cosmic rays and radiation, allowing only visible light to pass through, so it is safe.

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"Oh, there you are, Jin."

Father.

"This is the best view I've ever had."

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　About 30 minutes later, Reinhardt and Reiko arrived.

Did you enjoy your time together?

"Uh, ......"

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　Apparently out of concern, the other members of the group had not come for a while.



"Father, Marcia and Rodrigo would like to talk to you.

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"Yes, what is it?"

　I sit down at a table in the observation room and Reiko prepares a drink for me.

　In a relaxed atmosphere, Jin and the others began to talk.

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