100 zhang was not deep by Su Yu's standards. After half a joss stick's time, he had successfully dug to the top portion of the secret basement.
A light barrier appeared beneath Su Yu's feet. Through the light barrier, he could clearly see the sealed secret basement. It was not particularly wide, only 30 feet all around. There was only a stone bed and a table within.
There was nothing on the stone bed. But there was a golden imperial jade seal on the stone table. The imperial jade seal was carved with lifelike dragons—powerful and arrogant.
The rest of the items on the table had decomposed, but the imperial jade seal was covered with faint five-colored lightning, thus keeping it fresh and new, untouched by the hand of time.
Su Yu's heart thumped wildly. This was definitely a unique treasure!