The Air Sea Rescue Unit was established in 1965, where they provide search and rescue services for 37 miles of lakefront, an extensive river system, numerous lakefront venues, and the largest harbor system in the U.S. Chicago’s busy lakefront offers the Air Sea Rescue Unit unique emergency challenges including, assistance to boats in distress, water rescues and air search missions. Divers assigned to the Air Sea Rescue Unit are trained under public safety rescue diver guidelines specific to Chicago’s needs and particular environment. Pilot are trained in helicopter search and rescue, and hoist rescue techniques patterned after nationally recognized standards.