This was a favorite spot of mine growing up. We spent summer vactions on the beach in the Rio Del Mar area in Northern California and my parents live near there now. The biggest land mark there was "The Cement Boat" I remember asking my parents about it. Who would think that was a good idea? Well, apparently it wasn't. It is actually know as Th Palo Alto and was built in the Oakland ship yard in 1918 as a aprt of the World War 1 effort. She never saw action but has a casino and dance hall until the depression. It's been moored/sunk at the Sea Cliff pier as long as I can remember. As a child you used to be able to walk out on it and the fishing was great from that end. Now, it's not very safe and you can't go out on the boat, only view it from the end of the pier. We took my kids out of the pier at Christmas and they asked me the same questions I asked my folks. Who would make a boat out of cement?