It doesn’t help!! And Mark, your “feeling” face is a might off-putting…
Small cave? Seems large and well-lit to me… I mean, you ARE standing up and seem to have plenty of shoulder room!
OK, let’s wrap this up. Punch lines that last a week are (unfortunately) typical, but nonetheless tedious…
The Daily Trail 
What Doc should have said: “It was probably confusing, Mark? How many caves/mines did we see covered by a pile of rocks, as I mentioned?”
Of course, Doc should feel like an idiot for believing that bank robber’s b.s. in the first place; and still believing 40 years later.