Base jumping is an extreme sport that has gained significant popularity. To date, there are over 1, 400 jumpers who have earned their ”base number, ” which means that they have jumped from a building, an antenna, a span, & a terrestrial point. Base Jumping: The Ultimate Guide examines the history, subculture, & technologies associated with base jumping. in addition, it considers what the relatively new expansion of this activity means within the context of how our society considers danger & risk. After an introduction, its chapters cover base culture & ethics, the sport`s origins & current developments, techniques & equipment, sites & events, pioneering jumpers & icons of the sport, & future directions. The author-a former skydiver & base jumper himself-draws from careful research as well as interviews with current base jumpers to both provide historical context & represent the voices of those participating in the activity.