When one begins to read through the Hyperborea rpg books both the player's manual & the referee's guide along with the maps. One begins to find one very epic fact the seas of Hyperborea play a huge part in the welfare of the Hyperborean's lives.
If the seas are vast then the question becomes whatelse lurks within them?! In the past we've seen U1 Sinister Secret of Saltmarsh by David J. Brown along with Don Turnbull used in past Astonishing Swordsmen & Sorcerers of Hyperborea campaigns. Perhaps its time to look at U1 with fresh Deep One eyes. In the latest edition of Hyperborea the campaign setting has been tightened up quite a bit. So U1 Sinster Secret of Saltmarsh places Saltmarsh near Brigand's Bay.