So Jerry's brain is somewhat useful, Chen Qinghan thought and said, maybe there's another passage below that we just haven't discovered.
That's true, there's no rule that an ancient tomb can only have two levels. And not every Heavenly Maiden Tomb follows a fixed pattern; they are all built whimsically.
The space we're in is somewhat like an elevator repair room. I don't know, did the original builders plan for regular maintenance on the mechanisms and passages here?
In any case, the designers left us with a 'maintenance worker's passage.' Pete's team, Chen Qinghan and Jerry, as well as the Five Sisters combination, all used this passage to escape the multiple traps.
The Five Sisters combination then also led us to discover the second hidden passage. Below a shaft that could be embraced by three people, there was a hole just big enough for one person to crawl through.
