The Yesterday version was very heavily edited to fit the adverts in, loosing most of the underground bits.
They cut a boat trip down the river from Morwellham to Okeltor (just above Calstock). Arriving at Okeltor we disappeared into some bushes and (apperently) reappeared in Camborne - the joys of TV.
Underground on the full version we did some hand drilling, machine drilling (using my Holman 303H) and shothole charging and the obligatory fake explosion.
Wish they edited out the singing!