pencotts··on A rescue diver on what it was like to save the Thai boys in the caveBBC interview with John Volanthen is here https://www.youtube.com/watch?v=8p8XFvRJD7Q
pencotts··on Alexander Graham Bell’s Tetrahedral KitesLet us not forget Samuel Franklin Cowdery: http://www.atlasobscura.com/articles/man-lifting-kites-cody (not tetrahedral, but impressive)