From a while back (when it was previously on BBC1) but repeated: The Science of D-Day - BBC One On TV Today22:00 (Tuesday 19th December 2017) BBC FOUR "Seventy years ago one of the greatest amphibious assaults in history was launched from the south coast of England. And within a matter of hours, 7,000 vessels had landed 156,000 troops on the beaches ofNormandy. It was a manoeuvre that changed the course of the war and tested innovations in science and engineering for the first time. On this programme, engineer Rob Bell looks at the nuts and bolts which made such a staggering invasion possible. From giant troop carrying gliders to tanks that could drive on water. How necessity really did become the mother of invention. Like all new inventions - not all of them worked and resulted in devastating consequences. We find out why. This is the science of D-Day." i.e. clip here: Tank technology innovations, The Science of D-Day - BBC One Tank technology innovations Engineer Rob Bell explores the new inventions that made the Normandy invasion possible. The Sherman Duplex Drive Tank - known as the 'Donald Duck' was one of the most important innovations in the Allied offensive.
I hope I'm not breaking any rules by mentioning that it's been uploaded to youtube? Really neat to see the Valentine DD inflating its flotation screen.