At 10 am on February 8, 2009, we were sitting in our van at the Stone Tower Point location in the Saint Francis Yacht Club's Eastern parking lot looking North towards Angel Island. it was high tide and the bay was fairly calm. We later checked the tide tables and found out it was a slack tide at 10 am and that the moon was full. Bob was looking through his binoculars at the shoreline of Angel Island when he noticed something black moving West to East close to the island. He watched it for a minute or two to make sure it wasn't just a shadow of a wave when he noticed a second black object break the surface of the water at least 10 feet behind the first object. The second object submerged and resurfaced a few times while the first object remained above the water. Bob continued to watch it and at that point told Bill that he could see something unusual and black moving West to East right in front of Angel Island. Bill got the video camera out and began videotaping the objects as they continued to move from West to East. As the two of us watched, we could see that the first object stayed above the water most of the time while the second object behind it kept surfacing and submerging showing different lengths of it. At times both objects submerged for a second and then the first object would reappear above the surface. At other times the second object would surface and appeared to be elongated and longer than the first object. Bill was videotaping them from inside the van but then jumped out of the van and continued to videotape them. As Bill continued to videotape them and Bob watched them through the binoculars they looked like they were creating some white water between them as they moved along. At some times the second object looked straight like a log while at other times it looked curved like an arch. The distance between the two objects got smaller as they moved along the Angel Island shoreline. The way the two objects moved in relation to each other gave us the impression they were two parts of one animal. After the objects went East of Angel Island they passed right in front of a buoy and then a sail boat which was quite a distance behind them. Then they swam a little further West to East until a motorboat approached them traveling from the East to the West. The boat then passed very close behind them. After the boat passed them the two objects submerged and didn't resurface. It was at that point we stopped videotaping. Later we looked at the tape and the two objects appear to be the head and upper portion of the same type of animal we have seen in the past. When we examined the video at slow speed and frame to frame we were able to count the number of times the second object submerged and resurfaced and it was over 100 times!!!