Imagine my surprise one afternoon at work in Egypt, when two backpackers who I had taught to dive a few weeks earlier turned up in front of me asking me to teach their Advanced course. We had got on really well so I was delighted to see them again and when it turned out none of us had climbed Mount Sinai yet we decided to go together. Early start We met at an entirely inhuman hour and made our way to the meeting place. After what seemed like forever in a minibus bumping through the Sinai desert and the armed police check points in the hazy pre-dawn we came to…