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@Smallfurry
Something like 4cm of water is enough to Block a GPS signal. Which is why tri watches struggle, unless you swim with a very careful breast stroke, like the one your aunti uses to keep her hair dry.
So basically, according to that, St Petersburg has an open sewer full of floaters running down the city center.
(Thats assuming they ate the GPS trackers and poo'd them out. So as the give them the correct mass, and floatation. Which of course any self repecting scientist would.)