Lerna Heracles killed it, as the second of his labors. The strong Karstic springs remained; the lake, diminished to a silt lagoon by the 19th century, has vanished. Lerna is notable for several archaeological sites, including an Early Bronze Age structure known as House of the Tiles, dating to the Early Helladic period II (2500–2300 BC). The secret of the Lernaean spring was the gift of Poseidon when he lay with the "blameless" daughter of Danaus, Amymone. The geographer Strabo attests that the Lernaean waters were considered healing: Lake Lerna, the scene of the story of the Hydra, lies in Argeia
Greek frigate Hydra Greek frigate Hydra Hydra" (F-452) (Greek Φ/Γ "Ύδρα) is the lead ship of the Greek and flagship of the Hellenic Navy. The ship was built in the same shipyard as the Blohm + Voss MEKO 200 frigate class, on which its design was based. Three more vessels were built by Hellenic Shipyards Co. at Skaramagas in following years. It is the fifth ship in the Hellenic Navy to bear the name "Hydra". "Hydra" was the first of four frigates of the MEKO 200 type (the four being "Hydra", , , and ) ordered by the Greek government. The ship was