H1N1 pandemic from 2009 has infected 1.4 billion people, with only a 0.02% mortality rate.
Based on those numbers alone we can be pretty sure that it would have infected everyone on a boat.
If this coronavirus will have the same spread, we could be talking of 19,600,000 to 42,000,000 deaths, or even more if the infections happen all at once and overwhelm the hospitals.
So let's hope it's not as contagious as H1N1 or we're fucked.
I guess it could be worse. We could be talking of the Spanish flu, which killed more than 1% of the world population.