Ah Dai walked to the crevice and looked down, only to see a dim yellow glow beneath him, seemingly a deep passage. The spot that had just cracked open was actually a steel plate three feet thick. Below the steel plate, on both sides, were densely packed small holes. Familiar with Goris, Ah Dai knew that without correctly finding the way to activate the mechanism, even if one were to force their way in, they would likely suffer heavy losses. Moreover, they would gain nothing, for the mechanisms set by Teacher Goris were always so strict.
Ah Dai's trust in Goris made him proceed without any hesitation or fear, quickly descending with the letter in hand. As he went down ten steps, the rustling sound occurred again. Ah Dai looked up and saw that the crack had closed seamlessly again. He looked at his feet, knowing that the mechanism to close the door must be on this tenth step.
