"Who is this?" Ethan put on his clothes and asked Carl.

"Oh, I forgot to introduce you, this is Sophia, the fourth system warrior."

"Hello!" Sophia stretched out her hand generously, and her voice was sweet and pleasant.

Ethan nodded slightly, reached out and shook Sophia gently, which was considered to be a greeting.

"Carl, go! Come with me to the training ground and try my tricks. Ethan eagerly pulled Carl out.

Carl was dragged out of the laboratory by the powerful Ethan, and looked back at Sophia and the others with helpless eyes.

"See? You now know why Ethan changed jobs in just two months! He's a monster! Athera shook her head and said to Sophia.

Sophia nodded with a little understanding.

Sophia returned to the Vault again, earning not only a salary of 5.5 million points and a small amount of gold coins for the Vault, but also brought back 2 large boxes of medicines, which, according to Sophia, were given to her by the other party.

This is undoubtedly good news, both medicine and points are something that the Vault urgently needs at the moment.

Two days later, with the last batch of integrated materials being transported by engineering trucks, the upgrade program for Vault 125 officially began.

The entire Vault came alive throughout the day, with a large amount of materials being transported to the corners of each floor and stacked there, and both regular employees and mobile personnel put down their work at hand and turned into porters, transporting a large number of integrated material bins upstairs and downstairs.

Shelter upgrades are a technical job, so they need to hire a dedicated technician to guide them. However, directing the Vault upgrade requires understanding the layout of all the buildings and equipment in the Vault and being able to move around at any time, so it touches on the Vault's secrets and cannot be recruited from elsewhere.

Caroline was also too busy to touch the ground this day, and after walking quickly to the laboratory and talking to a few people, she turned around and left.

More than ten minutes later, a cylindrical machine on the side of the laboratory wall roared, and after the roar, a man wearing a noble robe embroidered with a pansy shield embroidered on it appeared in the laboratory.

"Uh...... Hello. A middle-aged uncle, the head of the laboratory, stepped forward to greet him. He only received the message that someone was coming, but he received no other instructions, and he didn't even know the name of the other party.

Looking at the confused looks on the faces of several people in the building space, the man in the teleporter shook his head with a smile, and muttered in his mouth: "Sister Lin is really, it's still ...... like this."

Stepping off the machine, the man said to the uncle with his hands behind his back, "Take me to meet your director." ”

The man had the same black curls as Caroline, but his pupils were blue and his sockets were deep, his features were tough, and his face was quite handsome.

Ten minutes later, the uncle's cheeks were covered with sweat, not that he deliberately fooled the man who could be seen to be a big man at a glance, but he couldn't find his strengths.

I asked an employee he was familiar with, and learned that the director had just gone to the armory station, and he was busy leading people to the second floor.

As soon as he reached the second floor, he bumped into Caroline and Edith head-on.

"Sister Lin, you can't be so snub just because I'm your brother, right?" The man shook his head helplessly and said.

"Coming so early? It's not like you're doing the wind. Caroline lifted her chin to Edith beside her, motioning for Edith to hand him the drawings.

The man in front of her is Caroline's half-brother, named Wayne Spencer. This Spencer is the Spencer family, one of the ten major families, and the actual head of the Spencer family is her biological mother, Doroly Spencer.

"Edith, she's pretty again." Wayne complimented Edith, drawing Edith's thanks and Caroline's eyes.

Wayne took the drawings of the architectural layout of the shelter, shook his head frequently while looking at it, and said, "You guys can't do this layout, it looks like Caroline did it, right?" How can you put the armory here? There is also a command center, obviously there is no need for a compartment, you see the location of this canteen, and the elevator design is too small, right? And this ......"

Caroline listened to Wayne's chatter and couldn't help but push him away, urging him to hurry up and get to work.

That's right, Caroline's eldest brother Wayne is the designer of this time, responsible for the renovation of the Vault after today's system upgrade.

After Wayne took over the task, he quickly sorted out everything and circled not only the areas that should be expanded, but also the space needed to upgrade to Level 3 and 4 Vaults in the future.

Inside the Vault, boxes of liquid-like integrated materials were opened, and when Vault employees dumped them on the ground, the surrounding walls automatically extended electronically like lines to connect the integrated materials. The connected integrated material suddenly seems to come to life, and can be freely expanded and expanded according to the will of the Vault Administrator.

"After this upgrade, your small shelter will be expanded from 1,000 by 1,000 to 3,000 by 3,000, and the capacity will be increased from 200 to 1,500-2,000." After the planning was completed, Wayne briefly explained the conclusion to Caroline, which immediately surprised the two girls.

"But...... We didn't buy that many materials, did we? Caroline asked, confused.

"The walls of your vault are too thick! It can be made into 100 mm, which can save a lot of materials. Wayne knew they still had doubts in their minds, and added: "The gate is still 200 mm, but there is no need to waste materials on the part of the outer wall hidden underground, and the exposed wall on the ground is just covered with stones and dirt." ”

Seeing the two girls showing a look of sudden realization, Wayne couldn't help laughing: "You two are really ......"

"But...... Someone will stumble and deliberately lure a group of intelligent machines to attack us. Edith described the last incident with Wayne.

"It's that group of guys again, I probably know who it is, the new Mayfield family, who specializes in making this kind of indiscriminate tricks, and the shelters destroyed by them are not one or two."

"Do this...... What's in it for them? Caroline is especially palpitating, the last time the Cockscomb is believed to be just a test, and there may be more powerful monsters in the future.

"The benefits? The benefits are huge! Not to mention the equipment and integrated materials in the shelter, it is the monster in this vast land, it is a very good hunting ground, and with one less shelter, they can station one more branch and build more strength. Wayne scoffed, disdainful of the Mayfield family's approach.

"Sister Lin, don't be afraid, next time there is such a situation, just come to me, and I will pay the cost." Wayne said boldly.

"Forget it, you'll only talk about it forever, why didn't you help me last time?" Caroline heard Wayne's promise, and her tone suddenly turned cold, and she sneered.

Wayne naturally knew what Caroline was referring to, after the last incident, the current Caroline was no longer strictly a member of the Spencer family, so naturally she could not accept the voluntary rescue and any form of assistance from the Spencer family.

"Forget it, it's not your fault that incident, after all, you can't help much, just don't say anything promised, you can't do it." Caroline said lightly.

Wayne's face was a little ugly, and he didn't know what to say for a while.

Edith hurried up to play the round, which eased the atmosphere a little.

After making a good plan, Wayne realized that he couldn't stay any longer, and after chatting with Edith about the current status of Vault 125, he left.