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I am Dan and many thanks for your question
I used to work for Skoda but no longer have access to the computer to check your model but I can still answer your question
Some VAG group cars are fitted with a water cooled turbo to check this you can see if you have water pipes going into your turbo.. if you do this is perfectly normal as the water gets pumped around the turbo to cool it down for about 2 mins after the car is turned of this is perfectly normal and actually a very good design they should do it on every model but the don't unfortunately, I am sure this is the noise your talking about as I have heard it many times and know exactly what your on about and its perfectly normal and safe
Many Thanks for your question and if I can assist further please let me know