Although he has been pitted by goblins more than once, Luca has to admit that the efficiency of their excavator is indeed amazing.

In his cognition, the work of digging a tunnel, which can make progress of ten meters a day, is not slow, but the machine brought by Gavin dug a depth of nearly 200 meters in less than two hours. Even with the Mana Crystal Nucleus as an energy source, the soil at the base of the tree is softer, which is fast enough to make people stunned.

And now, from the middle of the excavated passage to the place where the purple light is emitted, he should have visually measured at least more than fifty meters, and according to the speed of the previous day, it should be about half an hour to dig through.

The roar of the machine as it excavated the dirt certainly did not match that of an empty passage in the tunnel, and Lukka took out the handkerchief he had used the day before, torn into both sides, and stuffed it into his ear again, before turning on the switch and pushing the handle forward to his head.

After digging forward for a few minutes, more and more roots became tangled in the dirt. Those tiny roots can be cut directly by the excavator, anyway, this tree is sick like this, and this little loss is nothing.

But as the excavator dug deeper, the roots began to grow thicker, and Lukka began to need to flick the blue button that read "Clean Dig Head Debris" to keep the excavator running smoothly.

Even so, after twenty minutes of digging, the drill bit in front of the excavator made a "click" and stopped with a whimper.

"Why don't you move?" asked Dolan from behind his seat.

"It looks like the digging head is stuck, I can't see it from this angle, you touch it with the vine, is there a tree root stuck in the crack of the drill bit?" said Luca, pulling the handkerchief out of his ear.

In fact, Dolan's angle was even more inappropriate, he was now leaning back against the seat, his face wrapped around the back of the chair. However, the vine grew unaffected by the direction it was facing, and a few curly twigs grew from his right hand and poked through the gap between the digging head and the dirt.

"I seem to have touched it," said Dolan, "and it seems to be a little stuck, and it breaks one of my vine tips!"

"Then you get out of the way, I'll turn the digging head upside down. Luca said.

"Don't move, my climbing stem is stuck in it too!" Dolan let go of the vine tied to the back of the chair, turned around in an awkward position, stood up, and held the back of the chair with his left hand, "You let me try again." ”

As he spoke, the skin of the vine in his right hand had gradually hardened, from soft shoots to woody, and of course it had increased in strength.

"Alright, alright!" he stretched out the vine in his left hand, and with a few strokes of the passage wall, he dug a small hole, and then with a sharp force in his right hand, he retracted with what was stuck in the digging head.

"What do I say?" Dolan looked at the oval thing in his hand, "Edible rhizome, what a big piece! ”

"How do I look at a sweet potato?" Lukka said.

"Well, it's also called sweet potato and sweet potato, anyway, there are many names for this thing, and many places have different names. You don't know, this thing is related to morning glory. Dolan said.

"Then you put it away, and we can bake it and eat it when we get back." Luca started the excavator again.

After digging for an unknown amount of time, Lukka had some doubts in his heart. Although he didn't take out his pocket watch to keep time, according to his estimate, it was obvious that more than half an hour had passed, even if the excavation efficiency was slightly lower than when it was straight up and down because of the dense root system, and after digging for so long, it should have been a lot closer to the glowing place. But now, the purple light that came through the gap in the excavation head seemed to be no different in intensity than when it was first excavated.

If you dig like this, I don't know if the energy of the crystal nucleus can still hold up. Thinking so, Lukka opened the groove on the panel where the magic crystal nuclei were placed and took a look, the four crystal nuclei had already consumed a full three, and the last one had enough energy, and the value displayed on the panel was 92%.

"I hope it doesn't get stuck in the back again. Before Lukka could finish speaking, the digging head made another ominous "click" sound and stopped moving.

"Why don't you move?" Dolan asked again, his tone the same as the one he had just done.

"It's stuck again, you touch it with the vine again. Luca said.

"Again?" Dolan seemed a little confused, but did as Lukka had said, allowing the right hand to grow a shoot again.

"I seem to have touched it," said Dolan, "and it seems to be a little stuck, and it breaks one of my vine tips!"

Lukka suddenly realized something, and he turned his head sharply and stared at Dolan for a moment, making the wood spirit furious.

"Your climbing stem is also stuck in it?" Lukka asked suddenly.

"yes, how do you know?" said Dolan, changing the shape of the vines in his hands, and pulling out the round thing as before, "I said what? Edible rhizomes ......"

"The spindle family, that is, sweet potatoes, is related to morning glory. Lukka continued with his words.

"Yo, you know a little bit about plants. Dolan was a little surprised.

"Do you have any other sweet potatoes in your pocket?" asked Luca.

"How is that possible? I didn't have any dry food with me. Dolan said, turning out all his pockets, and there was nothing.

"Don't you remember digging sweet potatoes just now?" Lukka confirmed his suspicions.

Dolan shook his head, "Are you still sleepwalking? ”

Shut up and tilted his head to look at Luca, the bird's face was full of worry: "This kind of enclosed space may make some reverberations of the effect of the spiritual spell you have just experienced, do you want to take a break?"

"No, no. Luca frowned, "I'm pretty sure I don't have a problem. ”

"I've heard that mentally ill people don't admit they're sick. Dolan said.

"You're sick!" Lukka was a little irritated, he had touched on some truths, but he couldn't explain them to the two guys who were out of the way.

He thought for a moment, reached out and took the sweet potato from Dolan's hand, put it in his pocket, pulled out another piece of paper, took out a quill and a portable inkwell and handed it to Dolan, twisting the excavator's light to shine on it.

"You write it down on this piece of paper, it's ...... time now," Lukka took out his pocket watch and glanced at it, "At 3:54, the energy of the last crystal nucleus of the excavator is 92%, and then sign the name." ”

Although Dolan didn't understand what he meant, he still wrote as he said.

"And you, come here and press a paw print. Lukka picked up his shut-up paw, dipped it in ink, and pressed it on the piece of paper, next to Dolan's signature.