Nuclear traces found in the West Philippine Sea?

Scientists from DOST-PNRI, UP MSI, and the University of Tokyo have detected "unusually high" levels of Iodine-129 in the WPS. While this substance is a known marker for nuclear activity, researchers clarify there are no local sources in the area, suggesting the traces likely traveled from distant waters.

Source | https://www.gmanetwork.com/news/scitech/science/973279/scientists-find-nuclear-traces-in-west-philippine-sea/story