I am on tenterhooks this evening for several reasons.

Tonight they begin the rescue of the thirty three Chilean miners. I have been completely enthralled by this, from the moment that grimy, bearded figure waved at the camera through the drilling and the final slow, steady breakthrough into the trapped men's chamber, the testing of the Phoenix Rescue capsule, to now.

I am awed by the meticulous planning and superb organisation of the Chileans. Magnificent.

I remain on tenterhooks as I have for almost three weeks now, wondering whether I'll get more than four or five broken hours of sleep tonight.