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<p>[QUOTE=&quot;Valentinian, post: 2788310, member: 44316&quot;]The BBC has just posted an article on recent research on Roman concrete and why it works so well underwater:</p><p><br /></p><p><a href="http://www.bbc.com/news/science-environment-40494248" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.bbc.com/news/science-environment-40494248" rel="nofollow">http://www.bbc.com/news/science-environment-40494248</a></p><p><br /></p><p>Coins are not mentioned, but here one from Caesarea Maritima in Israel where a harbor was built using this concrete which sets underwater.</p><p><br /></p><p><br /></p><p>[ATTACH=full]647017[/ATTACH]</p><p>Severus Alexander, 222-235</p><p>22 mm. 10.36 grams</p><p>Eagle, wings spread, supporting wreath containing SPQR</p><p>Sear Greek Imperial 3374, Rosenberger II 86-93.[/QUOTE]</p><p><br /></p>

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