Birkenau is vast, cold, oppressive and eerie.

I want to leave now and come home - I have never been anywhere so depressing.

Karen and I are stood in the deathly quiet, imagining what it would sound like with SS officers shouting, dogs barking and the trains bringing 10,000 people a day through the camp. They were bundled into the selection yard where we are stood now, before they were murdered.

It's dark now, we are going to light some candles and have a small ceremony.

The final sign off blog will be from the coach in an hour.