Cerberus is an ultrasound diver detection sonar to detect submerged divers. Mod 1 was made by Qinetiq, in their underwater business division. It was unveiled at UDT 2003. The underwater division was sold to ATLAS ELEKTRONIK UK in 2009 and the Mod 2 version was developed by them. It is semi-intelligent and reportedly can detect an air-filled chest cavity underwater and let its operator tell whether the echo is from a man or something irrelevant such as a seal or dolphin, and to distinguish between: a shoal of fish; a ship's wake; a diver with an open-circuit scuba set; a stealth diver with a rebreather; flotsam and jetsam.^{[citation needed]}

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The Cerberus DDS system can detect open circuit divers, closed circuit divers, and underwater vehicles (e.g. swimmer delivery vehicles) with a high rate of accuracy. It has the ability to differentiate divers from marine life and other contacts. It can process thousands of contacts on each ping.^{[citation needed]}

The Cerberus system is available in two variants; configured for shipboard deployment or as a fixed system for port and harbour protection. The portfolio includes a range of optional equipment that enables the user to configure their installation appropriately.^{[citation needed]}

The system has a 360° coverage with an area detection of up to 4.5km² dependent on the acoustic environment. The GUI can display 50 tracks simultaneously and, once a threat has been identified, raise an audible and visual alarm to allow the user to take precautionary action.^{[citation needed]}

• Defense against swimmer incursions – Methods of protection from incursions by divers and swimmers

• Official website