HMS Hydra (A144) the first commission of HMS "Hydra". She was decommissioned and sold to the Indonesian Navy in 1986 and renamed KRI "Dewa Kembar" (Pennant Number 932); she was still in service in 2006. There have been eight ships of the name in the Royal Navy, named for the Hydra of Greek Mythology, a serpent with many heads (though nine is generally accepted as standard), the centre one of which was immortal. The monster was overcome and slain by Hercules. The ship's badge of HMS "Hydra" depicts the monster with seven heads. The ship's motto was "Ut Herculis Perseverantia" ("Like Hercules Persevere").
Orthrus overcome by Heracles in one of his labours. Orthrus In Greek mythology, Orthrus (, "Orthros") or Orthus (, "Orthos") was, according to the mythographer Apollodorus, a two-headed dog who guarded Geryon's cattle and was killed by Heracles. He was the offspring of the monsters Echidna and Typhon, and the brother of Cerberus, who was also a multi-headed guard dog. His name is given as either "Orthrus" ("Ὄρθρος") or "Orthus" ("Ὄρθος"). For example, Hesiod, the oldest source, calls the hound "Orthus", while Apollodorus calls him "Orthrus". According to Hesiod, Orthrus was the father of the Sphinx and the Nemean Lion, though