A $50 billion canal to be built by a Chinese tycoon in Nicaragua would be deep enough to allow submarines to pass through undetected. Billionaire Wang Jing has spearheaded what is one of the biggest engineering projects in the world and is three times the size of any other canal, yet shipping forecasters don’t anticipate a need for such a route in terms of trading. Many believe that Wang, who has not disclosed who his investors are, may be backed by the Chinese Government who hope to get a foothold in the continent where business has traditionally been dominated by...