The Emergency Service Unit is a component of the Special Operations Bureau of the New York City Police Department. The Emergency Services Unit (ESU) provides specialized support and advanced equipment to other NYPD units; its members are cross-trained in multiple disciplines of tactical and rescue work- primarily traditional Special Weapons And Tactics (SWAT) duties, physical rescue including vehicle accident extrication, water rescue, structural collapse rescue, the safe handling and subduing of Emotionally Disturbed Persons (EDPs) that include suicidal jumpers on buildings and bridges, and perform basic mechanical & electrical skills that patrol officers are not equipped to handle. As part of its water rescue capability, its members are all rescue divers and it maintains a fleet of jet skis and motorized Zodiac inflatable boats strategically stationed around the city for deployment when needed. The ESU Canine Unit deploys patrol/apprehension and bloodhound dogs to perform searches for perpetrators and missing persons.