Paedophile Geoffrey Portway will be deported from the US to Britain at the end of his jail sentence, which will be between 18 and 27 years.
Portway, who was born in Spain, possessed more than 20,000 images and videos of children being abused.
In recovered online discussions, he described his home-made dungeon as a place he intended to keep kidnapped children, sexually abuse them, murder them and then eat them.
More top news
An urgent appeal has been made to help trace the mother of a five-year-old girl who was found alone at a bus stop in Brighton on Friday.