Was traveling down the coast of California from San Francisco to Long Beach on the tugboat I work on. I saw two bright lights in the skyrunning toward the shore. They were so bright, then the brightness faded and we were able to watch the objects continue to fly and swirrl around each other in the air for quite some time. They stayed at the same altitude and seemed to be partnered up with each other some how. Both objects vanished and that was it.