"... Right. But an evil guy told us all to go downstairs. This, we don't know who put up the signs. They could be people like the doctor trying to tell us to go away from something good... but they might be other patients, or someone else entirely, warning us about really bad things." Usopp stared at the ominous entrance a little longer before turning arbitrarily away from the road.

"We definitely can't go explore something like that without the others! No way! So we'll just remember that on our great exploratory journey we found this place, and then when we next talk to everybody, we can tell them, there's a mysterious mine shaft up... north-ish... after you hit a road and follow it a little while."

He started walking away, trying to resist the urge to run before something could jump out of the entrance and attack them. "And we'll continue bravely exploring and discovering new things for later!"