Apparently, lightning strikes twice as often over shipping sea lanes than over the ocean as a whole. Wired recently published an article about research that comes to that conclusion and suggests an answer to the question. They note that it might sound crazy, but it’s true: The heavens cast their wrath and fury on the ships more than on the fishes.
The article continues: A comparison of lightning strikes between 2005 and 2016 in the eastern Indian Ocean and South China Sea (above) and shipping emissions (below) shows a clear correlation between where humans sail and where lightning hits.