The Aralkum Desert is covered in a layer of toxic, salty dust (Credit: Alamy) During the Cold War, Vozrozhdeniya Island was a top-secret testing ground for deadly Soviet super-pathogens. Despite over two decades of abandonment, their legacy lives on. On the Kazakh-Uzbek border, surrounded by miles of toxic desert, lies an island. Or at least, something that used to be an island. Vozrozhdeniya was