Anchor: The history is so little known--and so fascinating--it could easily have served as this novel's point of departure, or the spine of a novel all its own.
Entailed: The history is little known and fascinating.
Contradiction: The history is well known.
Contradiction: people are ina  submarine
Contradiction: The man had his head hung down while he was walking. 
Contradiction: He is a pauper who has no money at all.
Contradiction: Three people are working outside.