Wspalding. Please don't be offended by the caution (and humor) of the Trolls. They, dare I say we, are understandably protective of the bridge. I've been diving the bridge for years and a fairly regular poster on the Florida forum and would not presume to ask for specifics! Like Dan, I suggest you check in with Force-e or perhaps your son's instructor (by your post I assume he is taking the course locally). They may be able to vet you and give the info once approved!