Everyone began to proceed with caution, searching confidently and seriously. They traveled down several paths and visited a number of rooms, until they found, in a corner of a wall, a route just large enough for one person to crawl through—practically a drainage channel.
Gu Fan asked the others to stand guard outside while he went ahead and crawled into this drainage channel.
The group waited awhile. Although only a short time had passed, with their nerves on edge, they all hoped Gu Fan would return quickly, feeling that even a second longer in this place was perilously risky.
After a bit more time elapsed, Gu Fan returned and confirmed that the route led outside; it should be the escape route Xiaolan, the artificial intelligence, had spoken of.