We had the best tour guide! She was the essence of Coober Pedy. She was warm and approachable, ultra-Australian, a little hungover but still had an excellent sense of humour. We heard a few bad luck opal mining stories that seem synonymous with Coober Pedy. We learnt of the techniques and saw the various machines used to dig out the underground tunnels. I would recommend this tour. It is informative, inexpensive, easy to find, and fascinating.