The Greener-Martini Harpoon Gun is a modification of the venerable Martini-Henry breechloading rifle, which fires harpoons using .38 Special blanks. It has been used by sailors throughout the world to hunt whales and other really big game out at sea since its conception in the late 19th century. Oceanykan sailors in particular carry a bunch of these when carrying out super big-game fishing, for example Oceanykan Giant Squid or Tasman Whale.