What is "cloudbase"

Cloudbase is the fictional skyborne headquarters of the international security organisation Spectrum, from Gerry Anderson's science-fiction television series Captain Scarlet and the Mysterons (1967–68). In the 2005 computer-animated remake, Cloudbase is re-imagined as Skybase. In both series, the base's design is that of an airborne aircraft carrier, stationed in either Earth's high troposphere (1960s series) or low stratosphere (2005 series).