The Sea Raiders sea monsters include Scylla and Charybdis of Greek mythology, and the kraken of medieval times which is thought to have been a giant squid. Previous fictional encounters with giant squids are described in chapter 59 of Herman Melville's "Moby-Dick" of 1851, and in Jules Verne's "Twenty Thousand Leagues Under the Sea" of 1870. The narrator describes a recent period when a new sort of giant squid, a species named "Haploteuthis ferox", became known. (This fictitious name can be compared with the genus name "Architeuthis" of the giant squid.) As a part of the survey of the period, including early encounters
Twenty Thousand Streets Under the Sky Times" called the series "a dreamy but gritty period drama, superbly acted" and "the kind of television at which the BBC repeatedly excels – rich and fulfilling for its understatement, discreet tales that are well told." "Variety" praised the series, writing it "brims with a sense of yearning that takes the very old quandary of not being able to control who one loves and puts an evergreen spin on it. Moreover, the production itself is as meticulous as the storytelling, from the drab palette used in capturing the Depression-era surroundings to the melancholy score." Twenty Thousand Streets Under the Sky