The mast has been fitted on the Royal Navy's new aircraft carrier HMS Queen Elizabeth, making it Britain's tallest warship.
From the tip of the newly-installed pole mast to the keel, the carrier now stands at 73 metres tall - taller than Tower Bridge or Nelson's Column.
With a draught of 10 metres it means the aircraft carrier - due to be officially named by the Queen at Rosyth, Scotland, on July 4 - will stand 63 metres above the waterline.
But at that height, the ship is too tall to sail beneath either of the road or rail bridges over the Forth.
Engineers have created a solution by enabling the pole mast to be lowered until it is almost horizontal.
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