On January 1st 1995 a wave measuring a height of 18.5 meters was measured passing under the Draupner oil platform in the North Sea. Dubbed by the international scientific community as the "new year wave" it is an extreme wave. An observer on the platform would have seen a wall of water, twice as high as all other waves, approaching over a period of about one minute. Wave height being the distance measured from the trough to the crest of the wave, with a crest height 18.5 m above the mean water level, the wave height was 26m.
(See http://www.youtube.com/watch?v=K_JOBOvJEOg for reconstruction of the event - not good quality).
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