I saw one very similar to what you saw. It had that "submarine" look, was gray/black, and moved slow and low. Ours was a daytimes sighting. A little before 9 AM -- a totally non-spooky time.
I started at one point to collect such FREEPER REPORTS. Too tired tonight. Should do it some time though.
MOre have owned up on this thread, I think, than all the other threads combined. Interesting!
The fact that somehow we weren't scared to death is a puzzle.
And the utter silence.
The more I think of it, I'm not sure if the normal street sounds were drowned out while it was happening. Maybe the cylinder brought "stealth" with it?