In 1993, 14 imprisoned Buddhist nuns secretly recorded protest songs and smuggled the tape out of Drapchi Prison in Tibet. When word of the recording got out, the nuns say Chinese authorities added five to nine years to their sentences.  Seven nuns eventually were released, but remain in Tibet.  One died in custody and six others now live in exile. Four are currently visiting London to help raise awareness of the Tibetan struggle for independence and religious freedom.  Catherine Drew has more.