Duozu's eyes turned back at this time, showing inquiring eyes to Mula and David, and David shouted, this is it, go down!

After Muma translated it to Duozu, Duozu immediately lowered his altitude and stopped on the black rocky beach on the shore near the confluence of the river and the sea.

After disembarking from the back of the Duozu, David walked back and forth between the large and small rocks of the rocky beach, taking a closer look. Duozu and Muma waited patiently.

After some research, David returned to Duozu and Muma and said to Muma: "Well, these stones are very similar to the stones found in the massive sulphide deposits on the earth, but the color is slightly different, but I analyzed that they all contain metals such as copper and silicon, and this rocky beach has turned black due to air drying and sea erosion. ”

Muma thought about it carefully and said to Duozu in the language of the card: "These stones are useful. ”

Duozu said, "Then you ask him what you want us to do." ”

After Muma asked David, David stretched out his left hand and pointed to a brown stone three kilometers away from the coast in the opposite direction of the sea and said, "There is a large brown stone flat land there, look at the color, it should not be flooded by the sea, we can set up camp there." ”

After thinking about it for a while, David shook his head and said, "No, it's easy to be seen by human planes and even reconnaissance satellites." ”

Then he pointed to the large waterfall about six kilometers from the mouth of the sea and said, "Let's go there and have a look." ”

Muma relayed David's opinion to Tazu, who immediately asked them to return to their backs and fly to the edge of the big pool at the bottom of the waterfall.

"Boom Boom Boom !!"

Following Muma down from the back of the Duozu, he stood on the flat stone slope by the waterhole, listening to the deafening sound of the waterfall, and David carefully observed the terrain here.

I saw that this waterfall is 100 meters high and about 50 meters wide, and the waterhole at the bottom of the waterfall is circular and about 60 meters in diameter.

Behind the waterfall did not form the huge karst cave that David expected, but only formed an inner groove about ten meters deep on the cliff.

As for the brown cliffs that run parallel to the coastline five or six kilometers away, you can't see the left and right, and the height is the same as that of a waterfall, about 100 meters.

After David finished inspecting it, he said, "We need to make Duozu work hard, dig a big hole in the recess behind the waterfall, and level a gentle flat ground in it, where furnaces, blowers and other equipment need to be built. The blower needs to be driven by river water, so a waterwheel was built behind the waterfall. At the same time, some houses can be built in the big cave for us and slaves to live in. ”

Muma sighed and said, "Then, the cage we built before is useless. ”

David said, "Whoever told you to start brute force without asking." ”

Mu Ma pouted his three-petaled mouth: "Didn't you say you don't care." ”

David said, "Okay, the cage design ideas you made are okay. Once the cave behind the waterfall is dug up, let's build a few new ones in it, but change the design. The top should be tilted, in the shape of a herringbone, paved with stone slabs, the vertical wooden stakes are a little denser, try not to have gaps, outside the wooden stakes, put on a circle of stones, paved with animal skins inside, and fill the gaps in the stones outside with mud and hay, so that it can prevent cold and moisture. After all, those kaka will be the main labor force for the production of weapons in the future, and it is necessary to ensure their health and the right to rest, right? ”

Muma scratched his head and said, "I don't fully understand, when the time comes, you can take me, Duozu, and the slaves to do it together." ”

Next, Duozu took Mula and David back to the bottom of the crater, and saw that Zoya had already picked a lot of fruit, so Mula dragged the sleeping bag containing the fruit to the edge of the cage and distributed it to the Senkas from the Sa'o tribe.

At this time, the prisoners in the cage had calmed down relatively calmly, and one of the prisoners, who was older than the other Senka, namely Ava, asked Muma, "You, which tribe are you from, how can you do such a thing with the Divine Beast?" ”

Mu Ma continued to bury his head in taking the fruit and handing it into the cage, while faintly saying in the card control language: "It doesn't matter who I am, now please find out your identity, you are already a slave of the divine beast like me." I can tell you that if you work for the beasts with peace of mind, you will have a chance to return to your tribe alive. And don't fantasize about being able to escape, this is a big island in the sea, and you can't cross that wide sea to get back home. ”

Ava pondered for a moment and said, "My name is Ava, and I am the leader of the Sawn tribe, may I ask you..."

Mulma said, "Mulma. ”

Ava said, "Of the Sarai tribe? ”

Knowing that there had been a war between the Sarai tribe and the Sa'o tribe some time before she left home, Muma pretended that a trace of panic flashed in her eyes, and then shook her head and said, "Yes and what, no and what?" ”

Ava lowered his head and said gloomily: "Hey, why should the matter between the Senka tribes involve the divine beasts. ”

Muma said, "I have already said, this is not a matter of dispute between tribes, it is the divine beast that needs you to work for him. ”

Ava said, "What exactly? ”

Muma said, "Then you will know." ”

In the following days, Duozu took Muma and David back and forth between the aforementioned seaside waterfalls and the cave many times, and began to dig karst caves.

Under David's guidance, Duozu's steel teeth and claws played the role of an excavator, and it took six Earth days to dig a large karst cave behind the waterfall that was 100 meters deep, more than 10 meters wide from the water surface of the waterhole, 50 meters wide, and 50 meters high.

In order to prevent the cave from collapsing, eight stone pillars with a diameter of more than one meter were left in the cave.

At the same time, a culvert was dug on the side of the waterfall diagonally downward, connecting the cave with the ground on the right below the waterfall, and a ladder was carved out of the culvert.

As for the excavated stones, David found that they were all mines, so he had Duozu pile them up in a gentle stone clearing on the right side below the falls.

Then it was time to build other infrastructure, and on this day, in the cave of the gods, Muma distributed fruits to the slaves in the cages, and said to Ava: "Wait for you to produce two kaka, well, that's you, you choose another kaka, and go out with me and the beasts." ”

When the imprisoned Senka finished eating the fruit, Muma asked Tazu to push the stone door of the cage open, allowing Ava and another sturdy young Senka to get out of the cage, and Duozu pushed the stone back into its place.

After carrying the machete, crossbow, and quiver on his back, Muma picked up David and ordered Ava and another Senka to ride on Duozu's back.

Duozu instructed Zoya to take care of the prisoners, and once again soared into the sky, flying out of the crater.

After coming to the cave together, Muma said to Duozu, "Please ask the divine beast to find some trunks of the kind that used to be used as cages, and give them to us to process." ”