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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
A prototype of the Sentinel system is being built and assembled in nearby Avonmouth, from where it will be brought to the Gloucestershire site and deployed into the water.
Source: https://www.walesonline.co.uk/news/wales-news/disused-quarry-humans-learn-live-27749325