<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54caef3dbdfa1_-_underwater-engineering-02-0712-de.jpg>
<http://www.popularmechanics.com/technology/g870/7-marvels-of-underwater-engineering/>