DIC Investigation

[Gary]

If he checked into Cow

I highly doubt he checked in at Cow and would have no reason to not go upstream even if he weren't Abe Davis.

However he would have to be a cave diver to find the upstream entrance (he was probably shown it by someone) and to hit so many caves in as many days. Most of the locations were within a 1000' of the entrance and with in range of an Intro diver.