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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.
The deepest undersea rescue in history – when British engineers Roger Mallinson and Roger Chapman were trapped at a depth of 1,575 feet off the southwest coast of Ireland in 1973 – took place roughly eight times shallower.
Source: https://www.express.co.uk/news/world/1782966/ocean-depth-titanic-sub-rescue-spt