A two-stage solid-fuel nuclear-armed submarine-launched ballistic missile.
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Poseidon said nothing; instead he read through the notes he made earlier.
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At least £1bn is said to have gone down the Poseidon route.
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But sometimes the sea got angry, and Poseidon was the same way.
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NewsImageFile: On the hunt... a US Navy P-8 Poseidon aircraft in Perth.
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A US Poseidon P-8 aircraft also drew a blank, American media reported.