Hope was a blue whale that became stranded in 1891 in Wexford Harbour, Ireland, one decade after the Natural History Museum opened in London. However, we'll let him off the hook because they only went and replaced the Diplodocus plater-cast with a real blue whale skeleton and it is MASSIVE.
On Thursday, the museum presented an official unveiling of Hope along with the time-lapse video that shows the skeleton being pieced together from start to finish.
The blue whale will reflect the story of evolution, current diversity and increasingly crucially, our role in the planet's future.
Hintze Hall reopened today, Friday, 14th July, 2017, after undergoing an extensive revamp.
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Hintze Hall has another 10 new displays all chosen from the museum's collection of more than 80 million specimens.
Despite a petition to stop the move, the museum went pushed forward, saying the whale named "Hope" was "a symbol of humanity's power to shape a sustainable future".
For her night at the museum, Middleton opted for a £637 powder blue dress by London fashion designer duo Justin Thornton and Thea Bregazzi, featuring a fitted short sleeve bodice and full midi skirt.
Chatting to Attenborough about the reopening of the hall, the Duchess said: "You must have seen they've made a few changes here over the years", before they embarked on a tour of the museum.
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Up until recently the whale skeleton had been hanging in the mammals gallery.
The producers of the programme spent over two years behind the scenes at the Natural History Museum following the people involved in what has been one of the most unique engineering challenges ever undertaken.
The Natural History Museum has unveiled its first major refurbishment since the 1970s, transforming architect Alfred Waterhouse's Hintze Hall at the entrance to the museum.
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