In the 1980s, two men in a London flat devised a secret communication system linking the banned ANC in Lusaka, Zambia, with underground terrorists in South Africa. Their task was twofold: to smuggle ANC military leaders and vast amounts of weapons and explosives into South Africa for a violent and bloody revolution - and to make secret contact with Nelson Mandela in his prison cell.
Nigel Wrench presents the history of this operation.