While many believe the British Isles are not classically associated with seismic activity such as earthquakes and tsunamis, there is evidence that it has been hit before. One such example is the Storegga landslide off the coast of Norway which led to a 20-metre high tsunami hitting the British Isles 8,200 years ago. The Storegga landslide unleashed a huge wave on Britain’s northern islands as an underwater land mass larger than Scotland broke away from the seabed off Norway and rolled downhill.