Text: Rediscovered by well-diggers in the 18th century, the town is still being excavated, a delicate business as much of it is covered by the modern city of Ercolano.
Entailment: The town has been continually excavated for the past 200 years because the modern city of Ercolano was built on top of it.
Contradiction: The town was reburied in an earthquake in the 18th century.