The sudden tremor and the roar of the explosion spread throughout the entire sanctuary ruins.

From the direction of the sound, it could be determined that the source of the explosion was below.

In the lower layers of the ruins, aside from the Salvation Army's ongoing search of the military factory, there was no other human activity.

The need to use such a powerful blast indicated that the problem encountered was definitely more than just ordinary mutants, and indeed extremely tricky.

The mutant uprising triggered by this, along with the sudden intensification of spiritual pollution, became a catastrophe sweeping through several lower layers of the ruins.

"Run!"

Zheng Yan Ying was the first to react, roaring as she swung her warhammer!

While repelling the incoming tier one mutants behind them, she sprinkled holy water, driving away the awakened mutant creatures nearby, and simultaneously added shields to reduce the mental pollution's whispering impact on the team.

Otherwise, under the strong pollution impact, evolvers like Ah Lian and Ah Ming, with only early tier one strength, would not only hear confusing hallucinatory whispers but also experience indistinguishable visions and hallucinations.

They might even leave the team and head toward the monster horde.

Lin Feng, at the front, also took action, raising his large-caliber AK and switching to level 17 rapid fire cannon mode.

The explosive shells fired by the rapid fire cannon could regenerate automatically, whereas the holy water hollow point bullets were limited in number.

However, when facing the flood-like, continuously surging mutant horde, the hollow point bullet's single-target attack was clearly less effective than the explosive area damage of the rapid fire cannon.

Especially with the cannon's firepower; one explosive shell could repel several mutants.

Lin Feng activated the rapid pursuit attribute, gaining an ultra-high firing rate of ten shots per second in automatic mode, lightly pressing the trigger, and firing several shots, releasing dozens of powerful explosive shells.

Equivalent to dozens of grenades, they exploded densely 30 or 40 meters behind the team, instantly repelling the incoming 20 or 30 mutants, preventing the formation of a monster horde.

The rapid fire cannon's 3,000 backup shells were enough to support Lin Feng and the others in crossing the 3-kilometer distance to the entrance of the fourth basement level.

As Lin Feng kept shooting backward, the four women moved to the front of the team.

Lin Feng immediately ordered:

"Shen Yue, hold the shield to clear the path. Chen Shanshan, help kill the incoming tier two mutants. Ah Lian and Ah Ming, provide covering fire on the left and right, repelling blocking or incoming mutant creatures."

The earlier tremor and explosion awakened a large number of dormant mutants, which started running around in fear, and the majority just wanted to escape the unknown danger behind.

They weren't intending to attack Lin Feng's team.

This gave them time to react and use their available weapons to carve a bloody path through the monster horde.

But within the horde, there were also late tier one or tier two evolved mutants planning to ambush the tasty Lin Feng's team.

Now they could only rely on the four women rushing ahead, cooperating and staying on guard.

The rolling monster horde chasing behind could not be handled by Zheng Yan Ying alone, and Lin Feng had to step in to assist, to prevent the team from being engulfed by the horde.

If swept in, thousands of mutants crashing and biting, even with sealed battle armor, would lead to armor-piercing infection.

To escape, Lin Feng and Zheng Yan Ying had to intercept the monster horde, directing them to flee sideways.

The main road, as the widest passage in the ruins' layers, naturally gathered many mutants.

Fortunately, Lin Feng's firepower was strong enough, and his rapid fire cannon was equivalent to two fully-loaded infantry fighting vehicles.

With a 60mm mortar firing rate of 30 rounds per minute, or one every two seconds, while the rapid fire cannon fired ten per second, this was twenty times the firepower.

It was equivalent to Lin Feng alone operating twenty small mortars striking the monster horde from behind.

The fire suppression was naturally more than sufficient.

To avoid revealing too much strength, Lin Feng only activated the rapid pursuit attribute initially, successfully repelling the surging horde, before switching to the normal one shot per second, creating the appearance of limited ammunition.

At this moment, with Zheng Yan Ying's iron hammer held high, they pushed the charging monster horde back ten meters.

Lin Feng was responsible for the large-scale attacks, while Zheng Yan Ying dealt with the stragglers.

With their perfect coordination of fighting and retreating, they quickly helped the team withdraw to the entrance of the fourth basement level.

The monster horde, gathering with the mutants behind, continued merging.

Because pollution sources gathered on the left and right, the panicked fleeing horde clogged the main road leading to the third basement entrance.

With only one shot per second firing rate, it was no longer possible to stop dozens of mutants simultaneously pouncing and biting every second, and Lin Feng had to switch back to rapid pursuit, suppressing with ten shots per second in automatic mode.

Fortunately, the four in front, led by Chen Shanshan, had cooperated and successfully reached the stairway entrance.

Lin Feng and Zheng Yan Ying exchanged a glance, and after repelling the monster horde once more, they turned together and ran toward the entrance stairway.

During the escape, Lin Feng didn't forget to raise his left hand and launch a few powerful armor-piercing shells at the large swarm of mutants surging behind.

These armor-piercing shells not only easily pierced the mutants' flesh but also triggered the warhead's fuse during penetration, exploding instantly.

A massive 150 points of damage along with a ten-meter radius explosion range, just one shell severely injured all twenty or thirty mutants on the main road!

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