For me it was the crocs. Up close ,too big, too fast when they want to and came far to close when we hadn't seen em. Hell only knows the ones we didn't see. When you are in a smaller boat they just seem so much more active!!! Young and dumb was my excuse and in hindsight we were very lucly we didn't come a cropper from fuel management, too smaller boat and just being plain young and inexperienced in the top end.