My first thought was a giant walk-in cooler, but a giant generator building would make a lot of sense.
This would be something to ask the ITfag who says he recently grew a conscious and started talking.
G Earth POV of this area
Whatever it is seems to have some hella vicious run-off!
(yes, it moves with the waves. Even if it's an algae, it still seems to be reacting to something.)
Could they be dumping waste water into the ocean?