RE: HelderbergSearch Paper
The SA 747 was found at 4.4 KM in similar topography, and one year after the accident. The CVR was recovered and data extracted.
In 1980, Aerolinee Itavia Flight 870 suffered an in-flight explosion, thought to be a missile, while on route from Bologna, Italy to Palermo. Eleven years later in 1991, the company Winpol successfully located the wreckage at 3.5Km on the Tyrrhenian seabed. The FDR was recovered and data extracted, showing that just prior to the explosion the plane was in level flight and all the onboard systems were fully functional.