Satellite measurements of ocean temperature (illustrated by color) and the direction of currents (white arrows) help show where radionuclides from Fukushima are transported. Large scale currents transport water westward across the Pacific. Circles indicate the locations where water samples were collected. White circles indicate that no cesium-134 was detected. Blue circles indicate locations were low levels of cesium-134 were detected. Small amounts of cesium-134 have been detected in a water sample taken Feb. 19, 2015, from a dock in Ucluelet, British Columbia. (Woods Hole Oceanographic Institution)