In the work that's been done to date, diluted bitumen behaves very similarly in a marine environment to other forms of conventional crude. How much you can clean up depends on how quickly you get there. Certainly, the technology exists to ensure you can actually do most of it. In the context, for example, in Burnaby, when there was a spill from land that went into the ocean, it was almost 90% plus that was cleaned up.
On May 13th, 2019. See this statement in context.