Chapter 337: As expected of the boss, truly ruthless!

But besides an enemy attack, someone is attacking from the outside.

What else could cause an explosion above for no reason? Could something have impacted the ground?

Triggered by coincidence?

What is it?

A meteorite?

The more he thought, the more absurd it became; Zhang Yu forced herself to stop her chaotic thoughts.

Boom!!

Suddenly, another loud noise rang out. The metal layer used to protect the underground fortress had been completely breached, and a beam of light from outside shone in.

The explosion caused the underground fortress to shake incessantly.

Dust and dirt fell from the ceiling.

"Alert, everyone get on alert!"

Zhang Yu was so scared her heart felt like it was jumping into her throat, and she shouted loudly.

Rather than being scared, it was more that from just a moment ago, she had felt a great sense of dread in her heart.

Because the metal layer used to protect the underground fortress...

Its thickness had reached over a dozen centimeters.

This kind of thickness...

Was actually pierced through so easily?

"Continue."

Outside, Ye Su looked at the completely cracked metal layer, a smile appearing on his face.

Following the final ion cannon blast.

A hole with a diameter of three meters, leading to the underground, appeared before everyone's eyes.

"Ba Tianhu, you go down and take a look first."

Ye Su said.

Ba Tianhu immediately jumped down from the hole.

Fortunately, this Ba Tianhu was relatively slim; otherwise, if it were any larger, it might have gotten stuck in the three-meter-wide hole.