How convenient for Major Derry that his wartimebr headquarters had been in Consolidated Silversmiths' vault.’br An unexploded wartime bomb is discovered near the vault of a bank. Major Derry is called in to defuse it - but he finds it a golden opportunity to carry out excavations of his own.br br Produced By:……Christopher Venningbr br Major Derry:……..Richard Caldicotbr Mr Robson:…….Godfrey Kentonbr Mr Bradford:…….Clifford Norgatebr Sergeant Stringer:……Edward Juddbr Private Frazer:…….Michael Deaconbr Captain Moore:…….Leslie Heritagebr Colonel Bellew:…….Peter Tuddenhambr Major Parsonson:…….Alex Scottbr Grace:……..Joan Duanbr Police Inspector:……Sean Barrettbr First Policeman:……..David Robbbr Second Policeman:…….