On Sat, 15 Oct 2005 09:47:10 +0100, --s-p-o-n-i-x--
wrote:

I'd suggest a box fabricated from sheet lead and seam soldered would
be your best bet.

This will crack under its own weight. If you want to make a long seam in
lead, then it needs to be either mechanically joined (a rolled edge) or
a welded edge (lead burning).

Lead lined stone coffins have been discovered dating back thousands of
years.

Depending on the local water. In some conditions the water goes right
through them. Lead isn't actually that stable long-term, you need a
moderately hard water to build up a surface carbonate layer on it.