(1) There exists a 25-mile long fault line off the east coast of the US (right around the mid-Atlantic states). There are articles published over the past 2 years by scientists that predict the coming tsunami.
(2) There is an island in the Atlantic which has a volcano (not sure where, but there are lots of articles published about it), and scientists stated that if it should blow and part of it land in the Atlantic, a tsunami wipes out most of the east coast of the US from NYC to Washington DC.
(3) If Saddam uses the nuclear weaponry he acquired from us or from the Soviets, and blasts the Poles, most of Canada and the US get flooded.
Neither the fault line at the bottom of the ocean, nor this volcano are being guarded. I believe we have stations at both poles, but I doubt they are looking for wayward Iraqis.