Which method is NOT recommended for transporting an injured diver?

Crawling to the surface is not a recommended method for transporting an injured diver because it presents significant risks both to the injured diver and to the rescuer. This method could lead to exacerbating the diver's injuries, especially if they have any spinal or other serious injuries that require careful handling. Additionally, this technique does not maintain buoyancy, which is crucial when dealing with injured divers in a water environment.

The importance of ensuring that an injured diver maintains buoyancy, using a buoy for support, and utilizing a tow line are all methods that promote safety and stability during transport. These methods help to protect the diver from further injury and assist in keeping them afloat while ensuring the rescuer can manage the situation effectively. Maintaining buoyancy allows the injured diver to remain near the surface, making it easier for the rescuer to provide assistance and for both to be monitored while waiting for emergency services or to reach the dive boat.