Viviane Menezes, a marine scientist at the Woods Hole Oceanographic Institute in Massachusetts, has described the Red Sea as being like a “big lagoon” with “everything connected.” An oil spill at any time of year would be disastrous, she says, but seasonally variable weather and tidal patterns make contingency planning difficult. In the summer, Red Sea currents would drag an oil slick south, threatening Eritrea and Djibouti, and potentially entering the Gulf of Aden. In winter, circular currents would swirl more of the oil north.