After confirming there were no issues with the product, Ma Li took out a few shells and bullets, fitted a primer onto the bottom of the shells, inserted the steel core into the bullet head, and brought them to the leader.

Bai Ye took them, removed the insulated cup from his waist, aligned the mouth of the bullet shell with the cup's outlet, then controlled the liquid hydrogen and liquid oxygen from the cup to pour into the bullet shell, forming a hydrogen-oxygen mixture inside.

As the fuel and oxidizer were injected and the liquid vaporized, a thin layer of frost formed on the surface of the shell, dissipating and evaporating quickly in the over thirty degrees high temperature.

The bullet shell was held mouth down to prevent the hydrogen-oxygen mixture from escaping excessively.

Of course, Bai Ye's superpower was indispensable in expanding the space and controlling the amount of fuel in the shell.

Once the bullet head was fitted and locked tight, a bullet, which was slightly two to three grams lighter, was officially completed.

Ma Li then took a regular AK rifle, loaded it with these icy cold hydrogen bullets, aimed at a dirt and sand pile on the ground, and fired several shots.

Compared to traditional gunfire, the sound of ignited hydrogen was more muffled, with only a sharp whistle emanating from the muzzle, akin to the arrival of the Grim Reaper, shooting out each deadly bullet.

The effect of the hydrogen-oxygen mixture was excellent. After several validations, Ma Li confirmed the shooting stability, and the initial velocity of the bullet was even much faster than traditional gunpowder.

The idea of using hydrogen and oxygen for filling was completely feasible.

Lin Feng sat nearby, removed his helmet mask, seeing the Salvation Army's bullet production experiment before him, with his eyes gleaming.

Chen Shanshan, who stayed to assist, was the same way, watching curiously.

Seeing the other party successfully verifying the power of the modified bullets with hydrogen and oxygen, both Lin Feng and Shanshan displayed expressions of disbelief.

No wonder the Salvation Army was so eager to obtain weapon and bullet production equipment; the most crucial gunpowder source had already been replaced by hydrogen and oxygen.

This meant that the firepower of the Salvation Army in the future could be greatly enhanced, even achieving a qualitative leap.

There would no longer be worries about weapons and ammunition.

It was equivalent to having dozens of premium rifles with unlimited ammunition, and even some long-range firepower of mortars.

After the experiment, Ma Li picked up the shell from the ground and found that the casing was slightly expanded.

Bai Ye took it to examine and nodded, saying:

"Directly injecting hydrogen is still a bit dangerous, and it wears the barrel seriously, prone to backfire. It's better to follow the previous plan, put in hydrogen storage cotton, imitating the old nitrocellulose."

"When order is established in the future, buy basic chemical halogen furnaces and use hydrogen, oxygen, and nitrogen to mass-produce nitric acid."

Ma Li smiled with excitement:

"No problem, with this whole set of industries, we can also build a basic industry foundation in the future; then we can create engines and install them on aircraft."

Bai Ye let out a long breath, having stayed here for so many days, the purpose was finally achieved, and he saw a glimmer of hope, especially rare.

"Alright, let's seal it up."

"This machine is for Captain Lin. Ours is still being moved back below. Without Captain Lin's help, we might not have been able to move a single one out."

Ma Li frowned slightly, glancing at Lin Feng, who was sitting on the ground, his expression a bit dazed, feeling different from before:

"What, is it very dangerous inside the eighth sublevel?"

"By the way, did you bring some production materials? There should also be a lot piled up in the workshop, right?"

Bai Ye sighed lightly:

"It's a long story, but it was very dangerous. After moving two stamping machines, we came back directly; staying longer would have been risky."

"But the raw materials inside are just some copper plates, which we can buy from the guild with some money."

During the Old Earth Era, many mines were left over and are now controlled by top powers. Although there have only been more than two years' collection time, it's enough for major powers to consume.

Ma Li nodded and immediately arranged for subordinates to dismantle the circuits, remove the copper plate materials, and deliver the verified machine to Lin Feng.

At this point, Bai Ye slowly approached Lin Feng and said:

"Try not to delve deeper into the ruins, especially the three bottom layers."

Then he asked the young girl beside him:

"Did you find the Tier Two Source Crystal this trip?"

Previously, Lin Feng had stayed at the train station on the fifth sublevel. Bai Ye knew their mission required a Tier Two Desolate Wolf's Source Crystal.

The Church intended to cultivate Desolate Wolf alien evolution warriors, of tier two, to combat the Li Family's rebellion.

Upon hearing this, Chen Shanshan shook her head, slightly regretful:

"We've searched through the fourth sublevel and the fifth sublevel, but there wasn't a single Tier Two Desolate Wolf corpse. If we want to find one, we can only head to the train station tunnels on the fifth sublevel and see if there's a chance."

Bai Ye seemed to have anticipated this and nodded.

After all, before Lin Feng and others arrived, the Salvation Army had already roughly searched and cleared the layers between the fourth and the sixth sublevel.

Mainly to search for the aura of Tier Two entities.

They had killed many solitary Tier Two Mutants. If there were any Tier Two Desolate Wolf corpses remaining, lying still in place, naturally Bai Ye and others would have discovered them.

Upon understanding the situation, Bai Ye looked at the time. It was only twelve in the morning of the fourth day, and the exploration of the eighth sublevel had only taken ten hours.

And in those ten hours, the actual equipment transport process only took about two hours; the remaining eight hours were basically spent on the journey.

Just one trip down required traveling seventy-five kilometers, and a round trip was one hundred and fifty kilometers. Thanks to the majority of mutants being cleared from the top three and middle three layers, they could increase their pace, completing this final mission at a speed of twenty kilometers per hour.

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