"Follow my command, now!" the old man said angrily.
Ye Chenfeng and Sikong Zhairiyue were now very familiar with the tunnel leading from the underground base to the fortress, and they quickly arrived.
"If the fortress closes, we'll be in trouble. The fortress is made of a special alloy with a Mohs hardness of ten. Once it closes, we won't have any way out. We can only fight them inside," Ye Chenfeng said.
"Boom..."
But just at this moment, a booming sound came from nearby.
"No good, the fortress is closing," Ye Chenfeng exclaimed in shock, and his pace quickly accelerated.
"Damn, don't do this to us!" Sikong Zhairiyue was on the verge of tears.
"Click..."
One door after another closed, and the last big door was quickly closing as well.
It's not exactly instant, but the closing time definitely wouldn't exceed three seconds.
