The path was dangerous and I almost fell to my death at one point. But my uncle's quick thinking saved me. And for another day we made progress further into the Earth.

This isn't going downhill as steeply as we would hope. Could we be in the wrong tunnel? Perhaps we should turn round? But we've come so far, this is clearly leading somewhere. This job needs risk takers! Should we carry on, and see what we can find? Or do something else?