Burying P.M.'s

I used PVC pipe with end caps. Airtight and good protection. Pipe can be cut to length easily, and is available in several diameters. No glue necessary.

I've seen and worked with PVC that his been in the ground for fifty+ years that is decently servicable. More brittle, yes a little, but still workable. I install and repair irrigation systemsprofessionally  for residential, commercial and agricultural properties. I have worked on citrus and avocado groves where there is a mix of galvanized pipe, the old shedule 80 (grey, thin wall) PVC, and (relatively) newer schedule 40 and class 200 (white) PVC. Inevitably, the galvy is corroded from the inside and at the ends where coupled with fittings--anywhere there is no galvanization. However that shouldn't prevent galvy from being used for this purpose. It will definitely stay watertight for decades. ABS is real good to.

FWIW, I used PVC.

That's good to know. Fortunately, I was lucky enough to have kept my Kruggerands in the Polyethylene containers that they were shipped in, and then put those into PVC. Note: I 'diversified'  my  deposit locations by putting some in safe deposit boxes in two different banks, with some also being buried on my land and some buried on land belonging to family. Tried to not have all eggs in a single basket.

Thanks for all the posts on Burying P.M.s. When I mentioned the strategy to our children, they were immediately were excited by the plan. Their enthusiasm helps me balance my wife's total denial of the escalating currency crisis.