From smugglers to Britain's cold war government and everyone in between, there were many needs and uses for natural and man-made caverns. This series examines their usages in underground Britain.

Type: Documentary

Languages: English

Status: Ended

Runtime: 55 minutes

Premier: None

The Secrets of Underground Britain - Secret Intelligence Service - Netflix

The Secret Intelligence Service (SIS), commonly known as MI6, is the foreign intelligence service of the government of the United Kingdom, tasked mainly with the covert overseas collection and analysis of human intelligence (HUMINT) in support of the UK's national security. SIS is a member of the country's intelligence community and its Chief is accountable to the country's Foreign Secretary. Formed in 1909 as a section of the Secret Service Bureau specialising in foreign intelligence, the section experienced dramatic growth during World War I and officially adopted its current name around 1920. The name MI6 (meaning Military Intelligence, Section 6) originated as a flag of convenience during World War II, when SIS was known by many names; it is still commonly used today. The existence of SIS was only officially acknowledged in 1994 with the introduction of the Intelligence Services Act 1994 (ISA), which placed the organisation on a statutory footing for the first time and provides the legal basis for its operations. Today, SIS is subject to public oversight by the Investigatory Powers Tribunal and the Parliamentary Intelligence and Security Committee. The stated priority roles of SIS are counter-terrorism, counter-proliferation, providing intelligence in support of cyber security, and supporting stability overseas to disrupt terrorism and other criminal activities. Unlike its main sister agencies, the Security Service (MI5) and Government Communications Headquarters (GCHQ), SIS works exclusively in foreign intelligence gathering; the ISA allows it to carry out operations only against persons outside the British Islands. Some of SIS's actions since the 2000s have attracted significant controversy, such as its alleged acts of torture and extraordinary rendition. Since 1995, SIS has been headquartered in the SIS Building in London, on the South Bank of the River Thames.

The Secrets of Underground Britain - Foundation - Netflix

The service derived from the Secret Service Bureau, which was founded in 1909. The Bureau was a joint initiative of the Admiralty and the War Office to control secret intelligence operations in the UK and overseas, particularly concentrating on the activities of the Imperial German government. The bureau was split into naval and army sections which, over time, specialised in foreign espionage and internal counter-espionage activities, respectively. This specialisation was because the Admiralty wanted to know the maritime strength of the Imperial German Navy. This specialisation was formalised before 1914. During the First World War in 1916, the two sections underwent administrative changes so that the foreign section became the section MI1(c) of the Directorate of Military Intelligence. Its first director was Captain Sir Mansfield George Smith-Cumming, who often dropped the Smith in routine communication. He typically signed correspondence with his initial C in green ink. This usage evolved as a code name, and has been adhered to by all subsequent directors of SIS when signing documents to retain anonymity.

The Secrets of Underground Britain - References - Netflix