one thing i have always thought about when watching the movie was what that noise was whenever Gipsy appeared or ocasionally when it did something, for example when it use a double axe handle against knifehead. it also appeared at a much lower note durning the double event and seemed to emanate from Cherno Alpha. Is it an actual part of the jaegers like a warning sound to tell civilians to get out of the way because the jaeger is about to do something that could put them in more danger or cause a lot of collateral damage, or is it a movie effect that is there to make jaegers more epic pieces?