Diving without a bottle, in complete freedom, with no noise or bubbles, reducing the need for oxygen to lengthen your stay underwater a little more, becoming part of the underwater environment. This is freediving.
This diving speciality that solely depends on your lungs is practised as a sport, seeking the greatest depth or time of freediving and or as an exploration, using the techniques of this speciality to enjoy the maximum amount of time underwater, becoming totally integrated with the underwater environment or doing underwater photography.
Relaxation, control over your body and the application of hydrodynamic principles enable the optimisation of energy use and the reduction of oxygen consumption, lengthening the time one can be underwater.
