The Dragon in the Sea
 The Dragon in the Sea (1956) also known as Under Pressure from its serialization is a novel by Frank Herbert. It was first serialized in Astounding magazine from 1955 to 1956 then reworked and published as a book in 1956. (A 1961 2nd printing of the Avon paperback catalog # G-1092 was titled 21st Century Sub with the original title in parentheses.) It is usually classified as a psychological novel.