There is no such thing as completely certain; fairly certain is as far as one can go. The whole ship can be infected and it wouldn't become a pandemic because it is a quarantined ship. At this point, I see no way for it to become a pandemic unless one were to view this from a sci-fi thriller everything-that-can-possibly-go-wrong-goes-terribly-wrong scope. The level of global incompetence required for this to become a pandemic is astronomical.
If there is a phase 2, it will be to see what happens when the Wuhan lock-down is lifted. If this step is done with poor planning or prematurely and the virus is still sufficiently in the environment,it could get a second infectious wind.
The scientist leading the UK's research into a coronavirus vaccine says his team have made a significant breakthrough by reducing a part of the normal development time from "two to three years to just 14 days".
Professor Robin Shattock, head of mucosal infection and immunity at Imperial College London, said he is now at the stage to start testing the on animals as early as next week with human studies in the summer if enough funding is secured.
I wonder if Macau has closed her borders?
I'm fairly certain that there will not be a phase 2 where it becomes a pandemic. Because China acted so quickly, the disease is largely contained in the epidemic phase. Having a few infected people go to these countries while every CDC is on top alert with quarantining protocols is a pretty good way to ensure it does not progress to a pandemic.