There are essentially two choices of weapon for spearfishing: pole spears and spearguns. The speargun is probably the first thing that comes to mind for most readers - conjuring up images of Seahunt, James Bond, and countless other TV shows and movies. Everyone knows what a speargun looks like - a roughly pistol-shaped device that fires a two-foot steel dart. Everyone probably also has a pretty good idea what a pole spear looks like, but an underwater pole spear is a different in form and use from a terrestrial javelin. Rather than throwing it ( which would be difficult to impossible underwater ) a pole spear ( or "Hawaiian sling" ) has a loop of rubber tubing at the butt end that is used to launch it directly from the hand, the shaft sliding through the loosened hand without ever leaving it.