Testimony from Israeli military insiders involved in surveillance and remote killings features in documentary produced by the GuardianTestimony from 24 Israeli military insiders ​on the secret ​systems used in ​the war on Gaza​ has been revealed in a new documentary film about the mass killing of Palestinian civilians.NAZA, a film from the Oscar-winning Israeli directors Yuval Abraham and Rachel Szor, was shown at the Venice international film festival on Thursday as the only documentary