This is why the throw rope is the primary rescue tool for whitewater paddlers, since the rescuer can effectively help a swimmer from a safe position. A tethered rescue is an advanced rescue technique in which a rescuer swims out to the victim, manually frees them, and then holds onto the victim as they get pulled back into shore. A tethered rescue requires multiple rescuers and a PFD with a quick-release chest harness system. Anyone else present could be used to help secure the belayer, communicate with the rescuer, or provide safety down below. Turning the victim on their back, the rescuer can hug them from behind and under the arms while both are being pulled to shore. If the rescuer must release from the line, the best technique is to swim backwards with one arm while reaching under one of the victim's arms and hugging him or her so their head is resting against the rescuer's PFD.