A spooky howl can be heard bellowing out across Manchester city centre when it's windy.
The mysterious sound is caused by the 169-metre high, 47-storey, Beetham Tower.
In 2012, architect Ian Simpson, who lives in an apartment at the top of the tower, publicly apologised.
Video filmed on Sunday afternoon.
On several occasions, engineers have scaled the tower on Deansgate, which cost £150 million to build, to try and carry out repairs and modifications to reduce the din generated by its glass blade.