A Rescue System Rope That Floats. Intended for high-load applications that normally call for a lifeline, but also require a rope that floats, our New England River Rescue Rope is compatible with Prusik hitches, ascenders, pulleys, and other rescue hardware. Its core is polyolefin covered with a tough, abrasion-resistant nylon sheath. Rope is sold by the foot. Please contact customer support for maximum length available. Throwlines: A Safe Choice nA throwline bag is the safest way to reach a subject in fast-moving or still water. It provides a downstream safety backup when rescuers must enter the water. Throwbags should be kept in patrol cars, ambulances, and other emergency response vehicles.