Few industries are as synonymous with a nation as mining is to Wales. The Big Pit in Blaenavon is testament to the importance of the "black gold", so abundant in this part of the world, to Welsh life and heritage.
Though closed in 1979, Big Pit is Wales' oldest mine, and the main attraction now is a 50 minute underground tour of the unused mine shafts.
The guide, Des Harris, 62, from Markham, has been working down mines since the age of 15 and has a fair bit of experience under his belt.