It's from the fan blades.
During WW2, every country was struggling to make the airplane faster, but they found that propeller driven planes couldn't reach mach 1. Except for one...
A Russian bomber.
Actually, the plane itself never reached mach 1, but the massive engines drove very large propellers. At full throttle, the tip of those propellers would reach and exceed mach 1. Needless to say, it was very noisy. It is the first plane to 'achieve' mach 1, but it did so without moving an inch. The locals complained about the noise, so they switched to a dual propeller design.
(Military applications are an incredible resource of information!)
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