A voyage to the bottom of the Baltic Sea in a customised Guinness submarine was the star prize provided by Diageo last week to mark the 250th birthday of the black stuff.

Winners of the Guinness Experiences competition sunk a few pints of the stout in the sub's custom-built bar. Other prizes in the global competition include a trip into space with Virgin Galactic and a gig with Black Eyed Peas.

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