About the OP
I wonder why you wanted to come up with a hexagonal or octagonal design, other than they look cool?
Digging a frakking big square or rectangular hole is commonplace and known and "easy" for countless construction firms. Placing ISO/ConEx containers therein and covering them with the fill dirt again, a basic construction job.
If you wanted to be all fancy you could lay in a conventional concrete slab after leveling the hole, and place your containers on top of that. Cover with dirt, etc.
Lather, Rinse, Repeat
While an octagon or hexagon isn't incredibly difficult, square and rectangles are likely cheaper and perhaps faster to build with less questions asked by the locals.
As for construction materials like gravel and sand they could be used as some of the fill material on the sides or banked areas around the container cache. There is a map of their location relative to the entry to the cache and their removal wouldn't disrupt the integrity of the cache. Even in 2-5 years those would be expected to be completely overgrown.
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