Caerlaverock Castle: quantum tunneling

Four years ago Jim Al-Khalili made a BBC4 documentary about Quantum Biology that involved filming a large red ball passing through the walls of Caerlaverock Castle. I've now been! The ball was to demonstrate the idea of quantum tunneling, when a particle can tunnel through an energy barrier that is too high for it to surmount normally. My dumbed down explanation goes like this: Heisenberg's Uncertainty Principle says that the more sure about the momentum of a particle you are, the less sure you are about the position. So as the ball approaches the wall, become very sure about the momentum and the position blurs so much that it can include the inside of the wall. The ball goes through the wall! This is all much better explained by the wave function and discussing probabilities but I got the explanation past profs the other year when speaking to Sixth Formers. The BBC programme was explaining how Quantum Mechanics speeds up photosynthesis. Here's an link http://www.bbc.co.uk/earth/story/20160715-organisms-might-be-quantum-machines