I've mentioned before that, many years ago, the Cousteau divers would go back-to-back when sharks got too interested in them. They would have a pole with a very short spike on the end, which could be used to push away any shark that got too close (the spike was just long enough to keep the pole from slipping off), and with your buddy at your back, your blind-side was covered.
Reading through this thread, a back-to-back position would accomplish one other thing: it would make two divers pretty much appear to be one larger creature.
Reading through this thread, a back-to-back position would accomplish one other thing: it would make two divers pretty much appear to be one larger creature.