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<p>[QUOTE=&quot;Just Carl, post: 524664, member: 4552&quot;]Not necessarily. Water is much more dense that air or other gases. Also, there would have to be more than one source of an opening to allow air to escape for the water to enter. </p><p>Just to play safe and if not ever planning on opening the slab I would consider placing a bead of plastic glue around the entire sides, then submersing in a bath of liquid plastic, then encasing in a metal box where you could pump all the air out, then placing in a concrete slab. Still you never know. </p><p>Or opening the slab and placing the coin in an album.[/QUOTE]</p><p><br /></p>

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