Final update is waaaaay off. The proper answer is a Launched Grapnel Hook. It is attached to the end of a rifle and shot off with a line attached to the trailing wires. Link: http://gunshowgoods.com/zencart/index.php?main_page=product_info&products_id=28 Abusive comment hidden. (Show it anyway.)
Link: http://gunshowgoods.com/zencart/index.php?main_page=product_info&products_id=28