Text: In modern times the Sinai had become a backwater protected from the ravages of the modern world, and perhaps it would have remained one of the world's undiscovered spots if it hadn't been for one Self Contained Underwater Breathing Apparatus (SCUBA).
Entailment: SCUBA is one of the things responsible for discovering the Sinai.
Contradiction: SCUBA divers had nothing to do with the popularity of the Sinai.