Organized cave rescue units in the United States are generally city/county funded volunteer squads, composed mainly of seasoned, local cavers. A pioneer organization in cave rescue in the 1960s was the CRCN (Cave Rescue Communications Network). Although it was not, itself, a rescue unit, it served to organize communications and coordinate contacting experienced cavers in the area to facilitate a rescue. The CRCN nominally operated out of Washington, DC, and covered the mid-Atlantic area. The typical Southeastern US cave rescue team averages between 15 and 20 active members. Due to the excessive amount of manpower required for a large-scale cave rescue, it is not uncommon for multiple cave rescue units from various regions to assist another in extensive underground operations. Because organized cave rescue teams are quite rare, it is also quite common for local units to cover regions that extend far beyond the area they are nominally responsible for. The number of cave rescues in North America are relatively small compared to other common wilderness rescues. The average number of reported cave related incidents is usually 40 to 50 per year. In most years, approximately 10 percent of reported accidents result in death.