One intriguing object discovered at Soutra 15 feet down in the hospital drains was this fragment of heel bone. &amp;gt;&amp;gt; There are grooves which are running in a very regular almost parallel fashion along the edges of the bone. &amp;gt;&amp;gt; Oh, I see, yes, I can see, yep. &amp;gt;&amp;gt; Yep, with quite a bit of thickening of the bone around them. 