From Julien Borde, Freediving Instructor Do Freedivers Attempt to Maximize Underwater Time, Depth, or Distance?: Freediving students often ask me how long and how deep I
Redland Sport Divers: Encyclopedia and Dictionary of SCUBA terms and definitions.
From Julien Borde, Freediving Instructor Do Freedivers Attempt to Maximize Underwater Time, Depth, or Distance?: Freediving students often ask me how long and how deep I