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Protein in their blood explains why Sperm whales can dive in deep waters without need for air.

Sights for Azore eyes - Whale and dolphin watching in Atlantic, Portugal Giant sperm breed

Magdeburg Germany WWII | 03. Magdeburg Water Bridge — Germany

The Magdeburg Water Bridge is a navigable aqueduct in Germany that connects the Elbe-Havel Canal to the Mittelland Canal, and allows ships to cross over the Elbe River. At 918 meters, it is the longest navigable aqueduct in the world.