You can see the part of the river this took place on Google Maps. It’s not exactly a roaring rapid.
I never knew this old german punk song would be so appropriate: Die Ärzte - Cops Underwater
Lyrics:
Cops under water / That’s what i like to see
Wet uniforms / Water in the shoes
They just can’t swim / The guns are way to heavy
First they wriggle a little / But later not anymore
I could get help / But I like what I see here
Cops under water / What a beautiful picture
No radio that constantly squawks / It’s adorably quiet, yeah