Although abandoning the plan to use the observatory as a drifting ship made Mia feel depressed. But Mia had already thought that even if the observatory could be used as a drifting ship. Without machinery, they couldn't push the observatory into the sea. So Mia's depressed mood quickly recovered.

Miya comforted Xingyu instead: "It's okay! We didn't have the machinery to push the observatory into the sea anyway. Even if we had machinery, we didn't have fuel. Hearing the word fuel, Xingyu's eyes lit up and he said, "Let's go, go to the oil tank and have a look." After Xingyu finished speaking, he walked out, and Miya also guessed what Xingyu thought and followed Xingyu out.

The two came to the oil tank, and Xingyu checked the oil tank again. Xingyu had already found that the oil tank was unusually strong. The outer steel plate of the tank is thicker than the outer steel plate of the observation station. The oil tank is originally used to store oil, so the tightness must be good. The oil tank will definitely float on the surface of the sea. Moreover, the heat shield in the wall layer of the oil tank also has good buoyancy. Coupled with the heavy and sturdy base frame, the tank is not afraid of iceberg impact when floating in the sea. Moreover, it can also form a tumbler effect, and after the oil tank is overturned, it will also correct itself. Whether you're floating out of an iceberg-strewn sea or battling a big wave, this tank can do it all. It's just that this oil tank is too short, only six meters long. And the oval shape of the oil tank makes the interior space smaller. When Mia climbed into the tank, she saw that the space inside was half smaller than the living compartment of the raft. Mia's heart was suddenly dissatisfied, but think about it, at this time, solidity is the most important. So I was relieved.

Eventually, they decided to use the tank as a drifting boat. Xingyu immediately imagined how to renovate the inside of the oil tank, the round bottom was not easy to use, and it was difficult to put things. So Xingyu started by flattening the round bottom. Heung-woo returned to the studio and removed the legs of a few tables that could be folded. The reason why Xingyu chose the top of this table is because the width of the table can pass through the entrance and exit of the oil tank. Xingyu laid the table top flat on the bottom floor of the tank. When the bottom of the tank is flattened, there is more room to move around. Heung-woo tried to walk around the floor and found that there was a hollow floor underneath, which would be concave due to the weight. After measuring the height of the cavity under the floor, Heung-woo returned to the observation station to find furniture that matched the height and placed it under the floor. Heungwoo and Mia searched for a long time but couldn't find furniture that matched the height. In the end, I had to make my own base frame and put it under the floor to fix the floor.

The inner wall of the tank is a high-quality chemical-resistant plastic layer. Xingyu did not want to damage the inner wall of this layer of plastic, so as not to seep water into the inner wall after the outer wall was destroyed in the future. Luckily, there is a lot of silicone in the pantry. Xingyu fixed the floor with silicone to avoid the floor from moving when the oil tank rolled in the big waves.

Next, Xingyu moved the small pig iron stove in the greenhouse into the oil tank. Xingyu used an iron frame to fix the pig iron stove next to the ladder at the entrance. Then we have to solve the problem of smoke ventilation. The oil inlet of the oil tank is on the tank wall next to the entrance, Xingyu reverses the oil gate valve outside the oil tank into the oil tank, and then connects the smoke of the pig iron stove to the oil gate valve, so that as long as the gate valve is opened, the smoke can be opened. When the gate valve is closed, seawater from the outside cannot seep in. And they can make a fire in the oil tank to heat and cook. In the middle of the top surface of this kind of pig iron stove is the position of the smoke pass, and on both sides of the top surface, one side is the seat of the warm cup. On the other side, there is an iron lid that can be opened and closed, and after opening the iron lid, you can put the pot on it to cook.

In the observation station, Miya is most reluctant to be this pig iron stove. Seeing Xingyu move the pig iron stove into the oil tank, Miya was almost happy. The dissatisfaction with the small space inside the tank was all thrown out of the clouds.

At the top of the oval tank, there is a 60-centimeter-wide walkway. Xingyu then wanted to widen the aisle. When Xingyu first walked into the power station, he noticed that there was a construction frame for maintenance in the station. At that time, Xingyu was very surprised that the construction frame used here turned out to be a rare white steel construction frame. But it's also right to think that the entire façade of the observatory is made of white steel plates. Of course, it will not use ordinary iron construction frames. However, there are only six construction frame treads on the construction frame, which is not enough to lay the entire tank roof. Xingyu only has as many materials as he has, and he can do as much work as he wants. Xingyu used construction frames and pedals to transform the top surface of the oil tank into a platform 180 cm wide and 360 cm long. And the fence of the platform was converted into a platform with a construction frame.

After the completion of the platform, Xingyu saw that the construction frame had just been dismantled, and the remaining structural locks of the platform and the white steel long pipes of the stable construction frame were modified. Xingyu had a whim, before they were adrift on the sea, their boat had no power, and they had been drifting with the current. Even if they saw danger ahead, they could only watch the ship crash over. It's different if there are sails, the boat has the power to avoid danger.

It is not difficult to modify the mast and boom, but the difficulty is in the strength of the canvas. Heung-woo dragged Mia to the observatory's bedroom. Sheets and quilts could not be used, the cloth was so thin that it would be blown by the wind in two strokes. Heung-woo came up with the idea of making canvas out of the cloth of the mattress. Xingyu and Miya took apart the mattress, and the size of the single bed was 1.2 meters X 2 meters, and after dismantling, it was 2.4 meters X 2 meters. The two of them took apart the remaining three mattresses. The four layers of cloth are joined together and sewn into a spinnaker 2.4 meters high and 2 meters wide. When Mia sewed the sails, she also sewed pipes that allowed the mast and boom to pass through.

Heung-woo took the canvas sewn from a four-layer mattress cloth and returned to the drifting boat. Then, Xingyu locked the white steel pipe with a structural lock, locked the fence outside the drifting boat platform, and erected it as a sail pole. Then the canvas set sail pole is first, then a sawn white steel pipe is passed through the canvas pipe, and then the structural lock is used to lock the sail pole above the fence as a bore. After the sails were completed, Mia looked at the sails erected at one end of the oil tank and asked incomprehensibly, "The sailboats I have seen have sails in the middle." Why did you put the sail in the stern? ”

"How did I put it in the stern?" Xingyu said in surprise: "That's the bow of the boat!" "It's no wonder that Mia misunderstood, in ordinary boats, the entrance to the cabin is at the stern. So Mia naturally regarded the end of the entrance of the oil tank as the stern of the ship. In a normal sailboat, the pole is in the middle of the boat. However, in ancient times, before the invention of the rudder, the sail was set at the front of the ship. In this way, the sails can be pulled to change direction, but the rudder is always convenient. So after the rudder appeared, the front-mounted sailboat was eliminated. However, Xingyu used the method of front-setting the sail to modify the oil tank. In fact, the rudder is not difficult to modify, but their drifting boat cannot be used. Because the rudder is located at the bottom of the stern, the resistance of the current is used to change the direction of the ship. Now their drifting boat, still on the ice field, cannot be modified with rudders. So Xingyu had to use the backward design of the front sail.