Rainbow Warrior saboteurs carried out practice missions before bombing Greenpeace's flagship in Auckland 30 years ago, according to sources in France.
It is also claimed that the second in command of France's spy service, the DGSE, personally visited New Zealand before two explosions sank the ship at Marsden Wharf, killing photographer Fernando Pereira.
Autobiographies by Alain Mafart and Dominique Prieur, by veteran French DGSE operative Bob Maloubier, who died this year, investigations by journalist Jean Guisnel and other sources have exposed details of the mission and its run-up and helped to put real names to aliases. Among the revelations is that DGSE's combat divers carried out sabotage operations that helped provide a blueprint for the attack.
One was on August 14, 1980, knocking out a transmitter on Monte Capane, on the Italian island of Elba, that was used by Radio Corse Internationale, a pirate radio station challenging French policy over Corsica.
It honed skills in infiltrating agents into a friendly country and extricating them by sea.