Free immersion is a method used in diving where a diver descends and ascends without the use of breathing apparatus. Instead, the diver relies on a buoyancy device, typically a sled, to help them move through the water. This technique allows for a more natural and efficient way to explore underwater environments. In free immersion, divers can focus on their surroundings and experience the underwater world without the distractions of equipment. This method is often used in freediving competitions, where participants aim to reach specific depths while holding their breath. It emphasizes relaxation and control, making it a popular choice among divers.