The - old man plans to sail around world in world 's smallest boat . At 3meters - long , the vessel is only slightly bigger than a bathtub . The renowned boat designer Sven ##sson says creation is safer than big boats . Sir Robin Hamilton - Smith , first solo world sailor , says it is possible .
73-year-old man plans to sail around world in world 's smallest boat . At 3meters-long , the vessel is only slightly bigger than a bathtub . World renowned boat builder Sven Yrvind says creation is safer than big boats . Sir Robin Knox-Johnston , first solo world sailor , says plan is possible .