[Old Seadog]

"I'm guessing real tin works better than aluminum, and lead works better than both."

Lead works best when skin diving.

[bvw]

Hey -- I've worked in a lead shielded rooms a bunch of times. The first time -- at some quasi-national lab -- my boss stripped the lead out of the walls, made it into diving weights and sold them at his dive shop. His dive shop office annex was his office at the lab anyway.