The surging insect tide was still constantly impacting the energy barrier opened by the planetary engine fortress, and the pile of alien insect remains alone had already been built up more than ten meters high in front of the barrier force field.

It's almost suspicious that if this continues, the entire Shanghai will be flooded by the sea of insects along with the energy barrier, and judging from the number of insect swarms, it will be completely done, of course, provided that the barrier force field can still last until that time.

A large number of jumping insects climbed directly onto the barrier force field, causing more damage to the energy barrier by expanding the contact area.

This made the entire Shanghai fortress seem to be turned into an anthill, not only surrounded by a swarm of flying dragons like black clouds crushing the city, but also dense jumping insects crawling everywhere on the energy barrier, trying to get into it at any angle.

If you have a phobia of denseness, you will definitely be driven crazy by this scene, and even if the soldiers inside the barrier shoot outward with their eyes closed, they can still hit the dense jumping insects outside, causing them to fall from the barrier like dumplings.

It's just that their main task is not to eliminate these seemingly endless jumping insects, but to concentrate their firepower on killing the poisonous explosive insects mixed with a large number of jumping insects.

Unlike the relatively primitive fangs and claws of the jumping insects, the self-detonation of the poisonous explosion insect will obviously cause greater loss to the energy barrier, especially the high-strength corrosive acid produced during its self-detonation, which is far more threatening to the barrier than the claws of the jumping insects.

Therefore, even if a large number of jumping insects are allowed to climb the barrier force field, the Wandering Earth Force does not allow the poisonous explosion insects to have a chance to get close to the energy barrier, and orders the snipers to shoot them accurately as far as possible, and once they get close, they will be killed by the infantry with concentrated firepower.

Even so, a small number of Poison Blasters managed to hit the barrier force field and detonate themselves, splashing acid onto the barrier, continuously eroding the energy barrier.

"The barrier is 87% intact and continues to be depleted!"

At this point, Keystone's recharge progress has just reached 12%, and it seems that this attrition rate is acceptable at the moment.

But Qiao Lu knows very well that although the number of these alien insects that appear so far is huge, they are actually cannon fodder for the Queen of Blades trying to trick Nova Impact.

If it was the elite main force of the swarm, it would be a large group of thunder beasts that were impacting the barrier force field now, and there should be a large number of nest insect lords in the sky, as well as Leviathan, the flagship of the Queen of Blades, rather than just flying dragons, jumping insects, and poisonous explosion insects.

At this stage, the Wandering Earth still has to see the move, and wait as much as possible until the main force of the Zerg lands before using the new star impact of the keystone to annihilate it in one fell swoop!

Just as the insects outside were still continuously impacting the barrier force field, there was a sudden and unusual vibration from underground, as if a huge beast was moving underground.

"Unknown seismic movement detected, tunnel bugs attacking!"

Before the words fell, a terrifying creature like a giant sandworm broke out of the ground from underground, opened its bloody mouth and spit out countless alien insect troops from it, bypassing the barrier force field from below and directly entering the Shanghai fortress.

It was the Zerg's pit bug, a giant sandworm-like creature that could stretch itself to incredible lengths, using its flesh to form tunnels underground, allowing the swarm to weave through them at breakneck speeds through the wriggling and chemical irritants of the tunnels, posing a huge threat to what was supposed to be a safe area.

The barrier force field of the Planetary Engine Fortress is also unable to extend deep underground, which means that the alien worms that spit out from the body of the tunnel worm can directly engage the human army, which is what they are best at.

The defenders of the city immediately bombarded the head of the tunnel worm indiscriminately, trying to eliminate it in the shortest possible time.

However, even so, the tunnel worms still spit out a large number of alien insect troops and started street battles with humans in the urban area of Shanghai.

And there is far more than one tunnel worm like this, if they are allowed to continue to send alien insect troops inside, the barrier force field that envelops the entire Shanghai will be useless!

Faced with this situation, Qiao Lu immediately ordered:

"Drill beasts, it's your turn!"

Got a prototype from Cybertron and used it in an asteroid to mine energy crystals, and is now being reused as a war machine by the Wandering Earth.

The dragon-like steel worm burrowed into the ground like a tunnel worm, devouring and crushing soil, rock, and anything else with the jagged blade of its head.

Underground, the Drill Beast is simply like a fish in water, and the Wandering Earth was able to dig so many complex tunnels in a short period of time, thanks to this huge steel worm.

But don't think that the Drillbeast can only be used as a shield machine, and its body is covered with sharp serrated blades, which can not only rotate at high speed to dig tunnels, but also can crush everything that gets in its way like a meat grinder.

Stretching the pit worm underground to a soft body is undoubtedly the best target for the Drill Beast, taking advantage of its rapid delivery of alien troops in its body, using the high-speed rotating sawtooth cutter to cut it off!

Unlike the Drillbeast, which is covered in steel and blades, the Tunnel Worm has almost all of its armor on its head, and its body has to be as soft as possible in order to extend indefinitely, absorbing vibrations from the ground, but it can't stop the Drillbeast's steel teeth and iron mouth.

The Drill Beast easily bit off the bodies of several pit worms underground, and even when the pit worms tried to fight back through the blood disc mouth, they could also roll the jagged blades on their bodies so that they could not get down, and in turn bite off the soft bodies of the pit worms.

The existence of this terrifying steel worm makes it impossible for the tunnel worms to continue to go deeper, and the longer their bodies are stretched, the more likely they are to be strangled underground by the drilling.

Therefore, the tunnel worm can only break through the ground immediately after bypassing the barrier force field, and would rather withstand the ferocious fire on the ground than be bitten in two by the drill beast underground.

This greatly limits the effect of the tunnel insects, and they cannot go deep behind the enemy to carry out surprise attacks, so they can only barely bypass the barrier force field, giving the insect swarm a chance to enter the inside of the barrier.

It's just that even if they successfully enter the inside of the barrier force field, there are still a large number of fortifications waiting for them in the urban area of Shanghai.

There were human machine-gun positions on every street, and a large number of small prism towers were like telephone poles, so that the alien insect troops sent by the tunnel worms were stuck in the mire, and there was no chance to get close to the Shanghai No. 1 engine where the keystone was placed.

In this underground war, the Wandering Earth has an advantage by virtue of the Drilling Beast, and the Zerg is best at pit raiding, and there is no chance to come in handy now!