There is more to diving than meets the eye. While you must know your way around a tank, there are many other aspects that you will become more familiar with the more frequently you dive. It helps to have a number of skills that at first glance you may not assume have anything to do with the quality of your dive. Whether you are venturing out to sea with a guided group or you are exploring the open waters with one or two other divers, it is important to know a few things about knots. As a highly valued skill in sailing, it is no surprise that it comes up so frequently in diving situations as well. Tying down the boat to a mooring or laying a penetration line for a wreck dive are just a few examples of when you may want to know how to tie and rig some lines!