Text: Though the advent of air travel negates the need for passengers to take a long sea journey, the Suez Canal is still important for cargo vessels, and watching a leviathan tanker travel sedately through the passage is an unreal experience.
Entailment: It is an unreal experience to watch a tanker pass through the Suez Canal.
Contradiction: It is pretty common place to watch tankers sail through the Suez Canal.