I use the same floatline setup as spearfishers in Norway; the spearfishes use the floatline connected to the belt at all times, due to the strong currents. Down-welling is less problematic if you are able to drop your belt and pull your self back to the surface. In that way the floatline acts as your lifeline back up to the surface. In the belt I use a quick shackle, easy accessible for quick detachment.