Tasmania. The use of an RAAF aircraft to "spy" on its own territory led to the minister responsible, Senator Gareth Evans, earning the nickname "Biggles" (after the famous hero pilot of a number of books by Captain W. E. Johns). Another aspect of the F-111 which drew criticism was the poor work conditions for F-111 ground crew involved in sealing/de-sealing F-111 fuel tanks resulted in a class action lawsuit and the Australian government paying out more than A$20 million in damages. The health issues with chemical exposure included permanent brain damage to a number of ground crew before conditions were improved. A number of ex-USAF aircraft were delivered to Australia as attrition replacements and to enlarge the fleet. Four aircraft modified to the F-111C standard were delivered in 1982. The government bought 15 F-111Gs to supplement its F-111Cs in 1992 and delivered in 1994. Additional stored ex-USAF F-111s were reserved as a spare parts sources. Seven of the 28 F-111Cs and one of the 15 F-111Gs were destroyed in accidents during their service with the RAAF. These accidents took the lives of 10 air crew. The accidents occurred from 1977 to 1999. The F-111's fuel dump was located right between its turbofan engines, so engaging afterburners during a fuel dump would cause an ignition five feet behind the aircraft. Although strongly discouraged by the USAF, the RAAF F-111Cs frequently did these "Dump & Burn" maneuvers (also known as the "Zippo" and the "Torch") starting at Maple Flag in the 1980s. In 2000, two women graduated from the No. 6 Squadron conversion course becoming the first female F-111 Navigators. In mid-2006, an RAAF F-111 was chosen to scuttle the North Korean ship Pong Su which had been involved in one of Australia's largest drug hauls in recorded history. The ship had been sitting in Snails Bay, off Birchgrove, while the government considered its fate, and it was decided in March 2006 it would be scuttled by air attack. The Pong Su was sunk on 23 March 2006 by two GBU-10 Paveway II laser-guided bombs. Due to the airframe components of the F-111 containing asbestos, the remaining aircraft were buried. Six were spared for museum display. Retirement In 2007, Australia decided to retire all of its RAAF F-111s. The drawdown of the RAAF's F-111 fleet began with the retirement of the F-111G models operated by No. 6 Squadron in late 2007. The