Unknown right now. The leakage is not huge (way less than Exxon Valdez), and a lot depends on the weather, and what sort of progress they make in getting the leakage closed.
As soon as I typed that, I was like..well it probably matters even in open sea, but not as visual as on the beach.
OK science foks - change the subject - how bad is a spill in open ocean compared to on shore?
(I’m trying…)