While the floating incubator will be in international waters, it's still within the U.S.'s exclusive economic zone. Is there legal precedent that travelling to a floating platform in the U.S.'s EEZ count as an "exit" for visa purposes?
The map in the article suggests that the ferries will go to/from Half Moon Bay. But Half Moon Bay is not a Port of Entry. Is the expectation that the U.S. government will set up HMB as a Port of Entry? And if it doesn't, is this project still practical if the ferries are required to travel to San Francisco?
If the U.S. decides to bar someone on the platform from entry, doesn't that mean that person is stuck on the platform? How else would someone get from the platform to, say, the U.K., without going through a U.S. airport?