Being a landscaper by trade, Barry likely owned an auger attachment for his Bobcat. Following a cursory search on the matter, it was discovered that augers do not go very deep unless one uses the hydraulic type. Extensions are available. I'm still not sure how deep it will dig a hole. The attachment is not itself noisy. The Bobcat makes its own sounds but the auger really doesn't add any noise to the project.
Barry's auger may be noisier when he's drilling through hard surfaces such as rock. I still believe utilizing a mine shaft is possible. However, ...
Video posted in 2012
Digging his own hole, creating the burial space by himself, offers Barry complete control over Suzanne's location.
Are any pieces of their luggage missing? Could Barry have placed Suanne inside a suitcase, sadly, then buried the luggage. The ice cooler seems logical to use but also logical for LEO to inquire about why it would be missing.
Maybe he wrapped her in the missing brown towel
. The towel must be with her. I also feel a suitcase or duffle bag for transporting her body could have been used.
Whatever container, if any, that was used for toting purposes, had to be buried, didn't it? Mine shafts are typically quite narrow. He created his own burial site. jmho
Wouldn't want Suzanne getting stuck before reaching the bottom of a mine shaft like Heidi Planck in LA apparently did in the apartments' trash chute.
Tried to edit the scratch thru line to no avail. Sorry.