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").
Dragons in Greek mythology and possibly slain by Heracles. After a few years, the Argonauts passed by the same spot, on their chthonic return journey from Colchis at the opposite end of the world, and heard the lament of "shining" Aigle, one of the Hesperides, and viewed the still-twitching Ladon ("Argonautica", book iv). The creature is associated with the constellation Draco. Ladon was given several parentages, each of which placed him at an archaic level in Greek myth: the offspring of "Ceto, joined in love with Phorcys" (Hesiod, "Theogony" 333) or of Typhon, who was himself serpent-like from the waist down, and Echidna ("Bibliotheke"