The Multi-Million Dollar Treasure

JB McGregor is asked by two of his employees to help a man they had met at a yacht convention in Florida, David Wade. David wants to find some valuables that had been confiscated by dictators in Italy, Germany, and various other countries from families during between 1933 and 1945 World War II. David wants to return the valuables to the rightful owners or descendants. David Wade's father and his grandfather performed years of research and are almost certain that the valuables were being transported on a DC-3 airplane that crashed in the Sahara desert in 1953.
An expedition to the Sahara desert is formed to try and find a DC-3 airplane that crashed in 1953. The airplane was transporting stolen family treasures by various dictators during World War 2. The airplane was heading from Johannesburg South Africa to the United States where the treasures would be sold off. The airplane crash is assumed to be in the vicinity of the Ahaggar Mountains (also known as Hoggar Mountains) near Tamanrasset, Algeria because the last radio transmission of the DC-3 was to the Tamanrasset airport.
Unfortunately, a team of known criminals somehow got wind of the treasure and follow JB's expedition throughout the desert.