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: The Sinai would not be popular if it were not for SCUBA.
Contradiction: SCUBA divers had nothing to do with the popularity of the Sinai.