<i>Just three other nuclear merchant ships were built - the German oil transporter Otto Hahn; Japan's freighter Mutsu; and the Russian ice-breaking container vessel Sevmorput. Like the Savannah, they are no longer in service.</i><p>Umm, so the first nuclear ice-breaker was built by the Soviet Union in the 50s and was in service since 1959, 3 years before Savannah made its maiden voyage. Unlike Savannah, Lenin was in use for 30 years until it was decommissioned in 1989. Also in contrast to Savannah, its success led to 8 more Soviet nuclear ice-breakers built between 1975 and 1990. In fact, the most recent nuclear ice-breaker was built by Russia and entered service in 2007.<p><a href="http://en.wikipedia.org/wiki/Nuclear-powered_icebreaker" rel="nofollow">http://en.wikipedia.org/wiki/Nuclear-powered_icebreaker</a>