6Grotta di Nereo
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The Grotta di Nereo is an underwater cave that is located at Alghero, on the Island of Sardinia. The Grotta di Nereo is the biggest cave that can be found below sea level in the Mediterranean Basin and two different divers discovered it in 1957. The cave is unique because it has numerous openings and two central passageways for entry. Click the next ARROW to see the next photo!
