There are two modalities of descent in constant weight, “Using fins” (CWT) and “No fins” (CNF).

In the no fins modality the freediver uses the arms and legs to propel himself.
In the fins modalitie the freediver uses be-fin or monofin to propel himself.
Once the established level has been reached, a witness plate will be taken to the surface. The ballast used to perform the dive must be maintained at all times.