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The Lernaean Hydra was an ancient nameless serpent-like chthonic water beast in Greek mythology, . The Hydra of Lerna was killed by Heracles as the second of his Twelve Labours. Beneath the waters was an entrance to the Underworld, and the Hydra was its guardian.
The Hydra was the offspring of noisome offspring of the earth goddess Gaia.
After slaying the Nemean lion, Eurystheus sent Heracles to slay the Hydra, which Hera had raised just to slay Heracles. Upon reaching the swamp near Lake Lerna, where the Hydra dwelt, Heracles covered his mouth and nose with a cloth to protect himself from the poisonous fumes. He fired flaming arrows into the Hydra's lair, the spring of Amymone, a deep cave that it only came out of to terrorize neighboring villages. He confronted the Hydra, wielding a harvesting sickle (according to some early vase-paintings), a sword or his famed club. Ruck and Staples have pointed out that the chthonic creature's reaction was botanical: upon cutting off each of its heads he found that two grew back, an expression of the hopelessness of such a struggle for any but the hero. The weakness of the Hydra was that only one of its heads was immortal. Hercules and the Hydra.
Apollodorus could not defeat the Hydra in this way, Heracles called his nephew Iolaus for help. His nephew came scorch the neck stumps after each decapitation. Heracles cut off each head and Iolaus cauterized the open stumps.Hera sent a large crab to distract him. Its one immortal head was cut off with a golden sword given to him by Athena. Heracles placed it under a great rock on the sacred way between Lerna and Elaius and dipped his arrows in the Hydra's poisonous blood, and so his second task was complete. The alternative version of this myth is that after cutting off one head he then dipped his sword in it and used its venom to burn each head so it couldn't grow back. Hera, upset that Heracles slew the beast she raised to kill him, placed it in the dark blue vault of the sky as the Constellation Hydra. She then turned the crab into the Constellation Cancer.
Heracles later used an arrow dipped in the Hydra's poisonous blood to kill the centaur Nessus; and Nessus's tainted blood was applied to the Tunic of Nessus, by which the centaur had his posthumous revenge. Hercules slaying the Hydra, Hans Sebald Beham engraving, 1545
When Eurystheus found out that it was Heracles' nephew Iolaus, he declared that the labor did not count towards the ten labours. The mythic element is an equivocating attempt to resolve the submerged conflict between an ancient ten Labours and a more recent twelve.
Mythographers relate that the Lernaean Hydra and the crab were put into the sky after Heracles slew them. In an alternative version, Hera's crab was at the site to bite his feet and bother him, hoping to cause his death. Hera set it in the Zodiac to follow the Lion (Eratosthenes, Catasterismi). When the sun is in the sign of Cancer, the crab, the constellation Hydra has its head nearby.