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The Watch Below (1966) is a science fiction novel by British writer James White about a colony of humans stranded underwater in a sunken ship, who survive by air pockets, and a water-breathing alien species in search of a new home. The two generation ships encounter each other in the Earth's ocean.
originally posted by: pheonix358
a reply to: bally001
That takes me back awhile.
Try
Too Many Magicians by Randal Garrett. Great book with a great premise.
Or there are always my books.
P