What is Freediving - Free Immersion Discipline Explained
Free Immersion disciplines - Freediving
In Free Immersion, the freediver is allowed to use the rope for both the descent and ascent, but must keep the same weight throughout the dive and cannot use fins to assist them. Despite the emphasis on the small muscle groups of the upper body, the advantage of using the rope mean that FIM dives are usually almost as deep as CWT. Divers will usually pull down to between 20 and 25m on the descent and then freefall the rest of the way to the bottom using their negative buoyancy. The dives are often very slow with the last world record attempt for the men taking nearly 5 minutes!
Free Immersion: Technical Considerations:
FIM is probably the most forgiving of all the disciplines and is a common favourite for beginners. Divers have to be careful at depth however as the effort of pulling hard under the effects of water pressure can cause an injury. FIM freedivers usually try to maintain a long rhythmic pulling style and to remain as streamlined as possible to minimise the effort required from the arms. These small muscles can tire quickly causing the diver to slow down on the ascent.
Free Immersion : Specialist Equipment
Unlike the other competitive depth disciplines, the dive-line is an integral part of FIM diving. The line must be weighted heavily at the bottom to allow the diver to pull themselves down at the beginning of the dive, and have enough flotation where it's attached at the surface to allow the diver to pull up from the bottom. Most competetive divers prefer to keep their hands free on the descent and so use a noseclip to help with equalisation rather than a mask.
The lanyard, required for safety on deep dives is usually worn on the ankle for FIM dives so that the karabina which attaches it to the line doesn't interfere with the pulling action of the diver.
Free Immersion: World Records
Women - Natalia Molchanova (RUS) 91m
Men - William TRUBRIDGE (NZL) 121m