We soon reached a dam and had to make a decision. We knew it was forbidden to cross a dam, in the same way that it was forbidden ever to use a footpath or forestry track. (Unless it was part of the dreaded morning battle PT.) This was a simple rule on Selection to make sure that you got used to navigating properly and that the going underfoot was always hard, which it inevitably always was. (In fact I, still to this day, feel a bit guilty if I go hiking on a footpath--old habits die hard.)