A manual made for the experienced freediver who wants to complete new freediving skills that will allow him to reach 20 meters. The book follows the step by step instruction method to present all the open water skills for the deep freedive. Again, as in the first Guide to 10 Meters, we have tens of actual training photos that make it a serious collection of hundreds of deep freediving training pictures. This is the Freediving Guide for the 2nd Level - deep freediving, after the Freediving Guide to the First 10 meters (1st Level).