On Dec 30, 11:54*am, Winston wrote:

The soil is so saturated that digging 'down' causes
the walls to collapse. *The holes aren't getting
deeper, just larger in diameter.

These are gonna be Monster Footings! *

Technical fix: you can put a Sonotube type (cardboard)
form in the big hole, to hold a modest charge of concrete.
The hole sides needn't be the concrete form. Packing soil
around the Sonotube can be done before the pour, or
after.