An orthotube is a capsule-like high security interlocking door allowing entry to a building or office by one authorised person at a time. Orthotubes are typically used by security and intelligence agencies, such as the Australian Security Intelligence Organisation and the United Kingdom Security Service to control access to buildings housing sensitive information. The devices appear in the BBC spy drama Spooks, in which they are referred to as pods.
- Snow, Deborah (2003-11-08). "ASIO, through the looking glass". theage.com.au (Fairfax). Retrieved 2007-09-17.
- http://www.boonedam.nl/gbr/securityaccess/circlelock.asp Circlelock - High Security Booth from www.boonedam.nl
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