The addition of harpoon guns brings some exciting possibilities for underwater combat and maneuvering: it's a great shark deterrent (as it's likely gunpowder-based weapons won't be usable under water post-beta), and also brings the possibility that pirates will be able to attach themselves to opposing ships via the harpoons and potentially sneak up the sides. Of course, that's not the only new weapon to watch out for. The boarding axe, heavy sword, rapier, flintlock pistol, and blunderbuss will ...