<http://schema.org/description>
"These four causeways were built after the sinking of the HMS Royal Oak while it lay at harbour in Scapa Flow in October 1939."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.visitscotland.com/info/see-do/churchill-barriers-p669121?epaction=add&epkey=669121>