This is an exhaust fan on a subway air conditioner, full of dust and ordinary. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

The moment he saw this, Du Dian's mind suddenly thought of several things, exhaust fans, air conditioners, air conditioners, low temperatures, and ice cubes! That's right, it's ice!

His eyes lit up, in this ruined city in the wilderness, all the things of the old era were either rusty and rotten or weathered and destroyed, and it was almost impossible to find an impermeable bag that could seal the smell of blood on Helissa's body, but there was one thing that could be done, and that was ice!

"It's the dark snow season, the temperature is low, and it's easy to get ice cubes...... Du Dian's eyes flickered slightly, looking at the outside of the subway car, gusts of cold wind blew in through the broken windows, and he could vaguely see the hazy sky outside, and it was estimated that there would be a heavy snowfall soon.

However, he has no intention of waiting for this snow, this kind of thing that leaves his fate to God to arrange, he has never been the first choice, and the falling black snow contains too heavy nuclear dust, not to mention nuclear radiation, because of the nuclear dust, the black snow cannot accumulate into ice like ordinary white snow, but will be like loose sand, unable to knead.

"I can only make my own ice, and if it snows now, I can use the low temperature of the black snow to freeze the water into ice, but depending on the weather, even if it snows, it may be tomorrow or the day after tomorrow, and I can't wait that long." Dudian's eyes swept around the collapsed wall outside the subway, but he didn't find what he was looking for, presumably because the moisture wasn't heavy enough.

He glanced at Helissa lying flat in his chair, took a deep breath, and said, "I hope your luck won't be so bad." With that, he no longer hesitated, and quickly slipped out of the window and flew out.

He quickly came to the outside of the collapsed subway, flapped his wings, took off, turned his head to look at the buildings around him, and suddenly saw a collapsed building near the collapsed subway, and the building was wrapped with large vines and covered with a thick layer of moss.

Du Di'an's eyes lit up slightly, and he quickly landed away, leaving some attention to keep an eye on the vicinity of the subway, and once a monster appeared, he immediately rushed back to block it.

"There it is!" He landed outside the building, and when he pushed aside a vine, he suddenly saw a cluster of snow-white granular stones in the corner of the wall where the building touched the ground, and it was like frost on the building. His eyes lit up, and he quickly broke it off, threw it into his backpack, and then quickly collected it along the corner of the wall, and took all the white particles of stone that had been attached to the building.

"Good luck." Du Di said in peace, he didn't expect to find so much saltpeter so easily.

This substance is one of the ingredients for making gunpowder, and it can be combined with sulfur to make powerful gunpowder, but the principle is its powerful endothermic properties!

This saltpeter generally grows in shady corners, caves and other places, is a natural ore, and is also an excellent material for quick ice making!

Soon, Dudian collected a backpack full of saltpeter, and held a handful of saltpeter in his hand, and took all the saltpeter under the collapsed and overturned building, because of the angle of the building's rollover, so that the corner of the wall is not exposed to sunlight all year round, which is why so much saltpeter grows.

Dudian thought of making his own ice because he had seen these saltpeters growing along the walls of the ruins many times in the wilderness.

Sou!

He quickly returned to the front of the subway car, got into it, glanced at Helissa, who was still unconscious, knew that her body was being eroded by the poison, sighed in his heart, reached out and pulled out a rusty metal skin from the subway car, put a handful of saltpeter in his hand and rolled it into a ball, this tough iron sheet was like paper in his hand, kneaded at will, and soon rolled into a completely sealed metal ball, which was wrapped in saltpeter.

He tucked it into his backpack and grabbed it, then picked up Helissa in both hands and quickly rushed out of the subway car.

Although the materials used to make ice have been found, the area has emitted too much of the smell of blood, and it must be kept away as soon as possible, making it unsuitable as a hiding place.

And, he had to find a place close to the water source.

When he had flown over a number of places with the Shadow Hunter's eggs, he had flown over several places, several of which had water sources, and he immediately rushed to the nearest water source hiding place.

Sou!

When flying in the air, Du Dian suddenly noticed that there was a rumbling sound on the ground, but he saw several monsters nearly three meters tall, sturdy, and wolf-like monsters rushing down the street, and their direction was the direction of the subway where he had been hiding before.

He was secretly glad in his heart that it didn't take much time to find saltpeter, otherwise Helissa would be in danger.

The monsters hunted in groups did not notice Dudian passing in the sky, and the two quickly staggered and turned away from each other.

Seven or eight minutes later, Dudian finally arrived at this place with plenty of water, a collapsed square, the pavement of the square completely collapsed, and at the bottom of the square was a large pit, which had accumulated for many years of rain, and became a large pool.

Du Dian's thermal vision saw that there were only some finger-thick red heat sources in this sunken square pool, which should be water insects formed by radiation growth of germs that fell into the water from the monsters who came to drink water over the years, he stared twice, his pupils contracted slightly, and the pool in his vision seemed to become much more transparent, and he saw an underground drainage channel under the pool.

He looked in the direction of the passage, but did not see any heat reaction, and immediately did not hesitate, covering Helissa's nose and mouth with one hand, and holding her body tightly with the other, and swooped down quickly, crashing into the pool of water in the square.

With a splash of high waves, he carried Helissa and rushed into the water at full speed, his legs swinging, his wings were not retracted, but still flapping hard, his wings were not feathers, but a kind of hardened skin layer like a hard shell of wings, which could also be used as a boost in the water.

Sou!

His body swam straight and fast, even ordinary fish may not be able to swim as fast as he is at the moment.

The small heat sources scattered all over the pool seemed to sense the movement, and quickly swam in the direction of Dudian, but the speed was relatively slow, and they could not catch up with Dudian, but followed the current he swam through, and soon gathered into a group, following the current that Dudian passed, as if sucking the blood that had been diluted from Helissa's wounds along the way.

Dudian quickly swam into an underground drainage channel connected to the pool, and swam down the channel, his pupils always miniaturized, so that what he saw in front of him became somewhat transparent, and he could see the scene in front of the passage.

He swam as fast as he could, rounding the corners of several passages, and suddenly saw a dark passage that resembled a cave.

With a bang, he jumped out of the water with Helissa in his arms and landed on the shore at the water's edge.