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").
Cetus (mythology) Cetus (mythology) In Ancient Greek, the word "kētos" (, plural "kētē" or "kētea", κήτη or κήτεα)—Latinized as cetus (pl. cetea)—denotes a large fish, a whale, a shark, or a sea monster. The sea monsters slain by Perseus and Heracles were each referred to as a "cetus" by ancient sources. The term cetacean (for whale) originates from "cetus". In Greek art, "cetea" were depicted as serpentine fish. The name of the mythological figure Ceto is derived from "ketos". The name of the constellation Cetus also derives from this word. Queen Cassiopeia boasted that she and her daughter Andromeda were more beautiful