Within a radius of two meters from the center of the explosion, the mutants were directly shattered, with no chance of revival!

Such power can already rival the 105mm grenade cannons of the military during the Old Earth Era, a basic starter model in heavy artillery.

Above this, there are even more powerful 122mm rounds that can cover a radius of twenty to thirty meters, equivalent to a basketball court; and the 155mm grenade cannon, with a killing radius of over fifty meters, the damage area can cover two entire football fields.

This is also the main direction of upgrades for Lin Feng's Level 17 armor-piercing cannon afterwards.

Pursuing ultimate damage is to achieve a one-shot kill effect.

Just like now, when the armor-piercing cannon fires, the mutant monster tide that surged in by the hundreds immediately disintegrated.

Intimidated by the terrifying explosion power and sound.

For a moment, scattered limbs and shredded flesh were spread all over the main road, and nearby buildings were found hanging with shattered mutant flesh and blood...

Such a tragic and brutal scene, even the low-intelligence mutants felt deep fear.

They scattered and fled, no longer daring to gather together, chasing Lin Feng's team.

Taking advantage of this opportunity, the team of six successfully entered the entrance stairwell, climbed thirty steps, and reached the third basement level.

Shen Yue, who was walking at the front, saw a few bright lights emerging at the exit and instinctively raised the titanium alloy shield in her hand, squinting to observe.

Immediately after, seeing the lights clearly, it was the Salvation Army squad left on the third basement level to provide support.

At this moment, the opposing side also clearly saw the escaping explorers, realizing they were not their leader, and immediately asked about what happened downstairs.

Shen Yue and the others didn't know the situation, only mentioning there was an explosion at the bottom that startled all the mutants on the fourth basement level, and they barely escaped death, saving their lives.

After Lin Feng and Zheng Yan Ying ran out of the stairwell, the team of six then took a temporary rest.

Burdened with a hundred kilograms of battle armor, they sprinted three kilometers, dealing with mutants attacking from all sides; even for Evolvers, it was somewhat exhausting.

Moreover, the group had felt somewhat fatigued before, so now they needed to rest for a while to continue advancing.

Taking advantage of the entrance stairwell on the fourth basement level could block the rushing mutant monsters from below.

The entrance is only ten meters wide, plus the concrete walls on both sides, allowing Lin Feng's rapid-fire cannon to exert full power.

Just two consecutive shots can cover the entire stairway, repelling a dozen crowded mutants, scaring them back to the fourth basement level.

The Salvation Army's support team, seeing the mighty gun in Lin Feng's hand, calmed their frantic mindset instantly.

They realized the opponent's strength, especially Lin Feng in front of them, was not someone they could interrogate.

The captain quickly dispatched Lisa, standing at the back, to inquire about the situation.

Seeing Lisa approaching, torch in hand, Lin Feng continued shooting into the staircase behind him as he spoke:

"We really don't understand the situation, just operating and exploring within three to four kilometers around the entrance on the fourth basement level."

"The explosion originated from below the fourth basement level, probably the fifth or sixth floor; anyway, the power was immense, you should have felt the tremor on the third basement floor?"

Lisa nodded, worried:

"There was a slight tremble, the sound of the explosion can be heard, but the mutant numbers are sparse on the top three levels of the shelter ruins, each floor having less than a hundred, so you don't see a monster tide like behind you."

Lin Feng acknowledged:

"I estimate your Salvation Army's main force encountered some accident while searching for the military factory below, forced to use explosives with immense power..."

"If they have confidence in their abilities, after using explosives to solve the troubles below, they should be able to escape."

"It's about time we leave too."

"I advise your squad to return to the surface because just a dozen of the mutants from the lower floors, casually roaming out, aren't something your weapons can handle."

"Moreover, the mutants are now rioting, all in a frenzy state, even the Holy Water we carry has lost its dispersing effect, relying on torches alone is useless."

After saying this, Lin Feng immediately signaled the breath-catching team members to continue retreating upwards.

The main ones needing rest were Shen Yue and Ah Lian, to recover their strength.

The former carrying a massive shield weighing several hundred kilograms, the latter being weaker to handle sustained high-intensity combat; Chen Shanshan was more relaxed, using the titanium gun during the group's escape to knock down several attacking Tier One mutants.

The Demon-Extinguishing Holy Flame on her waist performed excellently.

When the four women encountered a Tier Two mutant, the Demon-Extinguishing Holy Flame took out the mutant and its seven or eight Tier One late-stage mutant followers with just two cannon shots.

Originally dealing 130 base damage, plus ten extra from armor penetration, making 140, with Holy Water's hundred percent bonus against mutants, adding up to 280, and then two gun barrels, two shots...

A total damage of 560 points!

Even Tier Two early and middle-stage mutants can be severely injured with one shot, knocked down with two shots!

Thanks to the terrifying damage from the Demon-Extinguishing Holy Flame, the four women's retreat went smoothly.

Now allowing Shen Yue and the others to catch their breath, Lin Feng immediately ordered to continue retreating.

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