In this Wednesday, June 14, 2017 photo, children jump into Istanbul's Bosporus Strait. The waters around Istanbul have turned a striking shade of turquoise due to a natural phenomenon called "phytoplankton bloom" which has turned the normally dark waters of the Bosporus and Golden Horn into an opaque tone of light blue. (http://www.apimages.com/metadata/Index/Turkey-Water-Color/145536581b3e4635ad40ffdab88f6845/2/0)