2. T HE L ERNAEAN H YDRA Eurystheus had not expected Heracles to come back alive at all, certainly not dressed like some wild, untamed brigand of the mountains. The king, however, was crafty enough to hide his dismay. ‘Yes … that was to be expected,’ he said, stifling a yawn. ‘An aged lion is no test. Now, for your next task. Do you know Lake Lerna, not that far from here? It is terrorised by the Hydra, which guards the gate there to the underworld. I wouldn’t dream of interfering were it not that the creature has taken to attacking and killing innocent men, women and children who venture near. I am too busy to deal with it myself, so I send you, Heracles, to rid us of this nuisance.’ ‘As you wish,’ said Heracles, nodding a bow of assent which caused the head of the Nemean Lion to snap its jaws violently shut. Eurystheus could not help but leap in alarm. With an ill-concealed grin of contempt, Heracles turned and left. The goddess Hera had prepared Lake Lerna with malicious relish. Not only were its waters infested by the Hydra, a huge water serpent with nine heads (one of which was immortal), each capable of spraying jets of the deadliest poison known in the world, but she had hidden in the lake’s depths a ferocious giant crab too. The Hydra reared up at Heracles’ approach, every one of its vicious heads spitting venom.fn4 Confidently enough he lunged forward and sliced one of the heads clean off. Instantly two new heads grew up out of the stump. This was going to be difficult. Every time Heracles sliced or clubbed a head two more sprang up in its place. To make matters worse the crab was now jumping up out of the water and making a frenzied attack. Its giant pincers came at him again and again, trying to slice him open and gut him. Leaping to one side, Heracles brought his club down with all his might and shattered the shell into thousands of fragments. The squelched creature inside reared its slimy body in the air, quivered and fell back dead. Hera placed her favourite crustacean in the stars where it shines today as the constellation Cancer, the Crab. But she was content. Her beloved Hydra was wreaking her revenge. Already it had twenty-four heads, each spraying a lethal poison. Heracles made a tactical withdrawal. As he sat at a safe distance, pondering what to do next, his nephew Iolaus, son of Heracles’ twin brother Iphicles, came out from behind some trees. ‘Uncle,’ he said, ‘I’ve watched the whole thing. If Eurystheus is allowed to encumber you with an extra trial, then I should be allowed to assist you. Let me be your squire.’ In truth, the intrusion of the crab had annoyed Heracles greatly. One quest at a time, that was what he had agreed to. The addition of a second, unannounced danger struck him as unfair. He accepted his nephew’s offer and between them they came up with a new plan of attack. I am inclined to believe that the scheme was more likely to have emerged from the mind of Iolaus than that of Heracles, who was a man of action, a man of passions and a man of limitless courage, but not a man of ideas. The plan was to approach the Hydra systematically: Heracles would advance and lop off a head, then Iolaus would step smartly in with a burning torch and sear the fresh stump, preventing any new heads from erupting in its place. Slice, cauterise, slice, that was the system they came up with – and it worked. After hours of exhausting and disgusting effort there was only one head left, the immortal head, the head that could not die. At last Heracles hacked this off too and buried it far underground. The Hydra’s poisonous vapours breathe up their sulphurous gas by the waters of Lake Lerna to this day. ‘Thank you,’ said Heracles to Iolaus. ‘Now you get home. And not a word to your father.’ Heracles knew that his twin would be angered if he heard that his son had been in such danger. Heracles felt no need to pay his respects to the Hydra. After all, the immortal head was still alive and belching hate underground. He knelt beside the twitching body not in reverence, but to coat the tips of his arrows with its congealing blood. The envenomed arrows would prove to be immeasurably useful – and immeasurably tragic. Their use would change the world.