Unbelievable! Very large circle shadow drifted across the water and docks at the port of los angeles headed north east.shadow was about 300 feet across silently drifting with no noise and nothing in the sky to be seen causing the shadow.myself and two co workers witnessed this as well as numerous longshoreman,all of whom stopped working to watch this event.has anyone else seen this? We were all stunned and cant stop talking about it.absolutely nothing in the sky could be seen or heard while this huge shadow moved across the port.