Yes! It's located on the bottom part of that big-cliff/overhang just to the left of the
middle of the huge panorama. You can't miss it! There's the prominent dark shadow
below that big-cliff/overhang. Using a clock analog for the panorama, the middle
of the panorama would bel ocated at 12 O'CLOCK, the big-cliff/overhang would
be about 10 - 11 O'CLOCK.

With the red-blue 3-D 'glasses' you could see that big-cliff/overhang prominently jutting out from the far crater-wall.....And with 3-D glasses, look closely at the middle of the
bottom of that jutting cliff/overhang!...There's the [I'll say it!] ORIFICE.

My definition of cave? An orifice large enough for a human to crawl into.

How can Opportunity 'prove' it's a [using my definition] cave/cavern, since Oppy
will not get close enough to physically inspect it?

ANSWER: A large orifice in that rock wall should have a specific infrared-signature
[or lack of an infrared-signature]...I'm no expert in either geology or infrared signatures,
but it seems obvious that a cavern, cubby-hole, "giant" VUG, should appear dark in
the infrared compared to the rock wall around the cave/orifice entrance.
Will Oppy's mini-TES suffice for gathering the necessary evidence?

Jacob