Ji De took the lead, and Qi Yue used his spiritual power to lock onto Ji De's body, following him through the portal.
Inside the portal was a descending staircase. After about a dozen steps, the two arrived at a vast space. Qi Yue could clearly sense that the surrounding area was entirely made of alloy, and not just any alloy, but of a superalloy with exceptional hardness and ductility. With his spiritual power, trying to probe out from above was also extremely challenging. He feared that even if there were a nuclear explosion outside, as long as it wasn't directly above, this place would not be greatly affected.