aidi a6 :- whining noise

hi all, hopefully someone will have an idea what this problem is. i have an 1999 audi a6 2.5 tdi saloon. and all of a sudden its started
sounding like a sack of spanners. there is this whistling hissing kinda noise especially when the clutch is depressed, the turbo i think is working fine and this was new 14 months ago. now we did have some serious flooding were i live in hull but was very careful i did not get water in the car. the car drives the same as normal as not lost any power and had a full service 8 months ago if any one as any ideas i would be very grateful thanks stef
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.