Lionel “Buster” Crabb, a diver employed
by SIS to conduct a clandestine survey of
Soviet warship hulls. His mysterious
disappearance during his last operation
led to a political crisis.Greville Wynne, SIS’s intermediary with
Oleg Penkovsky, who was arrested in
Budapest and placed on trial in Moscow.
His confession included details of his
work for SIS and caused considerable
embarrassment.