In addition to refining some magic weapons and pills that are scarce here, Hongwu will also collect some high-grade materials unique to this place, which may be useful in the future. Although he has seen a lot, there are countless types of materials in the cultivation realm, and the methods of collocation are as vast as the sea, and Hong Wu only knows some of them.

For example, a pair of giant claws of the Cancer Demon are the high-grade materials for refining weapons, and the carapace on its body can also be used to refine armor, the scales of some fish monsters can also be used to refine fish scale armor, and the teeth and bones of some monsters can be used to refine weapons.

The flesh and blood of the demon beast and the inner pill can be used for alchemy, so the whole body of the kraken is a treasure.

In addition to a large number of krakens, there are also some undersea mineral deposits in the sea around Linggui Island, but these mineral deposits are difficult to mine, in addition to resisting the huge water pressure of the deep sea, they also have to guard against the attack of the kraken, and the monks usually go to mine in teams.

Zheng Meng learned that Hong Wu liked to collect all kinds of materials, and after getting the consent of his two elder brothers, he selected some rare materials stored on the island and gave them to him.

"How do you mine the seabed?" Hong Wu asked.

"There are many mining teams on Spirit Turtle Island, and the casual cultivators are generally a pair of five people, using water beads to avoid the sea water and diving into the bottom of the sea to mine, they are generally two people responsible for mining, and the other three are guarding against the attack of the Kraken. Our people are using submarines to go to the sea for mining. Zheng Meng said.

"Submarine?" Hong Wu asked.

"Diving boats are similar to flying boats, because the monks who live on the islands often go to the sea, so they developed diving boats. Small submarines can carry five people, medium-sized ones can carry ten people, and large ones can carry twenty people. We have three large submarines on Linggui Island. There are 12 medium-sized submarines and hundreds of small submarines. Zheng Meng introduced them one by one.

"Can you show me there?" Hong Wu said that the function of this submarine is similar to that of a submarine, and he would like to see it.

"Senior Hong, please!" Zheng Meng took Hongwu to the dock by the sea, and Linggui Island would clean up the monsters in the sea near the dock from time to time to ensure the safety of the mining team. Forty percent of the income collected must be given to Linggui Island, and most of the casual cultivators will choose to pay for their own safety, after all, their own lives are the most important. And there are not many smoke on Spirit Turtle Island, and there are sixty or seventy percent of other islands.

The boat is shaped like a rugby ball, with a circular transparent window at both ends and sides that provide a view of the monks inside. But they generally use their psychic sense to detect their surroundings. The purpose of the window is to allow the driving monk to avoid some of the reefs.

After placing the spirit stone, it can activate the energy shield, which can resist the attack of the Kraken. There are also two thrusters on both sides of the back of the submarine, which can greatly speed up the speed of the submarine after all are activated, but the consumption is very large, and it is generally used when escaping.

"Are there any design drawings?" Hongwu had some itchy hands, and wanted to refine a submarine boat to go to the sea to play, although the Shenlong battle armor could also be launched. But it was only a solo outfit, and he didn't want to run around the bottom of the sea. With his current cultivation. You don't need any magic weapons to stay at the bottom of the sea for a long time.

"Seniors want to refine submarines?" Zheng Meng didn't expect that Hong Wu could refine weapons, he wanted to see how a master of Hong Wu's level refined weapons, so he took Hong Wu to the refining room on Linggui Island, and asked the refiners below to prepare the drawings and materials.

"Master Zhou, Master Li, this is Senior Hong, a great master of the Transformation Period, if you want to refine a submarine, you hurry up and prepare the best materials." Zheng Meng said.

As soon as the two refiners Zhou and Li heard that they were masters of magic, they immediately took out the best materials for refining the submarine in the warehouse, and stood at the door of the room with a blank eye and refused to leave.

"Senior Hong, look, can they?" Zheng Meng smirked embarrassedly, and wanted to fight for the two of them, ordinary refiners are not allowed to watch from the sidelines, so as not to be learned.

"Well, they'll just stay here and do it for me." Hongwu doesn't care about the Tao, what he can learn depends on their creation.

The drawings of the submarine boat are not complicated, it is composed of the body of the boat and several parts, and the spiritual energy in the spirit stone is transmitted to each part by the rune array.

Hong Wu first refined all kinds of materials, as soon as he sacrificed the Chaos Divine Fire, Zheng Meng and the two refiners opened their eyes wide, this kind of dark gray flame they had never seen before, when they saw the speed of Hong Wu's refining, they were stunned by the power of the Chaos Divine Fire.

The various materials melted at a speed visible to the naked eye, and the impurities in them were quickly refined, leaving only the essence part. Due to the strong effect of the Chaos Divine Fire, the materials that could have been refined into a large submarine have been condensed a lot after refining, and now it can only refine a medium-sized submarine boat.

The shape of the hull has not changed, it is a Volkswagen fusiform, and the thruster was designed by him in the shape of a turbine, which is more energy-efficient than traditional thrusters. Hongwu also refined a detector modeled after the submarine's radar system, which could amplify the monk's spiritual sense and detect greater distances.

It only took two days for the entire submarine to be refined, which made Zheng Meng and the two refiners have to be impressed.

"Zheng Meng, do you want to try this submarine?" Hong Wu threw the shrunken submarine to Zheng Meng and said.

"I can't ask for it!" Zheng Meng took the submarine, and randomly pulled over a Jindan period monk from Spirit Turtle Island to act as the helmsman, and the three of them walked towards the dock just now.

The submarine was handed over by Zheng Meng to the helmsman named Zhao Xing, Zhao Xing first checked the quality of this submarine at random, and then couldn't put it down, this was actually a medium-grade spiritual artifact-level submarine.

The water here is not as polluted as it is on Earth, the water is clear and blue, and schools of ordinary fish swim near the submarine from time to time, and Hongwu can hardly name it.

Under Zhao Xing's control, the submarine dived towards the deep sea, and along the way, Hongwu also encountered some monks who were diving with water beads, which propped up a spherical shield to cover them, as if they were staying in a bubble.

There are also many monks who have submarines, but the grade is much worse than Hongwu's, and its speed and defense are far inferior to Hongwu's.

Soon, the three of them took the submarine to a mining site, this is a trench, about ten meters deep, there are many submarines parked in the trench, some monks are mining in the mine, and some are patrolling outside, so as not to have a sudden attack by the kraken.

Hong Wu asked Zhao Xing to stop the diving boat, opened the hatch and came to the deep sea, where the light was very dark, but the monks' eyesight was very good, and there was also spiritual assistance, so there was no trouble.

Zheng Meng saw Hong Wu get off the submarine and came out closely, while Zhao Xing was left in the submarine by him to guard.

All the monks basically knew Zheng Meng, and when they saw him and Hong Wu giving salutes one after another, Zheng Meng smiled back one by one, without a little arrogance, which made Hong Wu look at it a lot.

Hongwu lowered his head and walked into a mine more than two meters high, this mine is not deep, only more than three meters, it should have just been mined.

There are two monks in the cave who are mining, this kind of ore is very hard, the two of them are using magic tools and mining picks to clank, and when they saw Zheng Meng and Hong Wu coming in, they immediately stopped their work and saluted the two.

"You keep mining, we'll just come in and see." Seeing the two of them standing aside, Hong Wu spoke up.

When the two heard Hong Wu's words, they saluted Hong Wu and Zheng Meng again before continuing to dig the mine.

Hong Wu stretched out his hand and pressed it on the wall of the mine, grabbed it with his five fingers, and picked off a large piece of ore, he said: "This ore is of good quality, quite hard. ”

Zheng Meng was stunned from the side, this is a deep-sea dark iron that is known for its hardness, it can only appear in this extremely high water pressure environment, the texture is very hard, adding a little deep-sea dark iron when refining the magic weapon can increase the hardness of the magic weapon a lot.

Although it was only raw ore here, it was also very hard, and Hong Wu grabbed a large piece with his bare hands, which showed how terrifying his physical strength was.

"This is known for its hardness in the deep sea, one of several high-quality ores on the seabed." Zheng Meng said. (To be continued......)