C473 An Old Friend

"The iron door weighs more than a ton. There is no way to break it open with your hands. Let's take a look at the other passages!"

Heihu tried his best not to move the iron door in front of him. It seemed that he could not open it with the help of the mechanical knife.

There was no electronic device like a password lock on the iron door, so Xiaoqi and Black Tortoise could not help