Nessie found!

And here she is:

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A 30ft (9m) model of the Loch Ness Monster built in 1969 for a Sherlock Holmes movie has been found almost 50 years after it sank in the loch.
The beast was created for the Billy Wilder-directed The Private Life of Sherlock Holmes, starring Sir Robert Stephens and Sir Christopher Lee.
It has been seen for the first time in images captured by an underwater robot.

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A still from the movie showing the new prop made following the loss of the 30ft version

http://www.bbc.co.uk/news/uk-scotland-highlands-islands-36024638

So no old aeroplane wrecks, then!