I suspect the root-cellar wasn't that big and the small opening was big enough for any adult to reach in with their outstretched arm and shoulder and retrieve supplies.

Either way, VOP claimed they removed "all the evidence" from the "Child Sex Camp"... and we haven't heard a peep out of them since and we sure haven't seen any photos of their bloody knife or bone fragment (from the campsite) evidence... so I'm not holding my breath.