This time with the World's Toughest Fixes crew and the truly inimitable Sean Riley. Now I've shot a lot of Nat Geo films over the years and hung out with some pretty wild and crazy characters. Riley is well and truly up there. He spends his time perfecting excruciatingly funny gags and exploring the minutia of modern music - as well as occasionally studying some particle physics. They didn't just break the mould Riley was cast in - they shattered it!

What an equation. The Large Hadron Collider + the wit and whimsy of Sean Riley = a great shoot which never disappointed.

Most of every day we were 300 feet underground - amidst the billion-dollar equipment that will one day soon recreate conditions a few microseconds after the Big Bang. Occasionally though we surfaced from our hi-tech mole hole. At one point we found ourselves at an ultra-high-end watch factory where the goods list for tens of thousands of dollars and the craftsmanship is nearly as incomprehensible as the inner-workings of the Large Hadron Collider.

During another exit we discovered a vast field of daisies with spectacular mountains behind. Riley used the location for an impromptu 'Sound of Music' performance (think 'High on a hill was a lonely goat-herd...' and you get a fuller picture!)

But by far our favorite above ground exploit was on an Alpine luge ... a one-person cannonball run down the side of a mountain in a tiny bobsleigh on stainless steel rails. The owner - a Nat Geo fan - gave us free reign on the luge for an entire afternoon. "Why?" you might ask. Because Riley was playing at being a proton inside the Large Hadron Collider of course! As is often the case with our filming - especially in public places - our antics utterly baffle onlookers. A small crowd gathered at the base of the luge... watching as time and time again Riley hurtled down ... bellowing about how he was 'approaching the speed of light'... 'nearing absolute zero'... and 'coming close to the Big Bang!'... all the time chasing or being pursued by one of us wielding a camera.

The science, the action, the drama was all there - as you'll see on "World's Toughest Fixes: Atom Smasher" but so, most definitely, was the fun!