On my way to work I saw a suspicious branch that was zooming down the ditch. I swung around to look at it again, and it suddenly submerged for about 45 seconds, then popped back up and started to zoom away again. When I tried to ride up near it again it submerged again. I never saw it come back up, so after a while I just photographed the ditch where I had expected it to resurface. I have no idea what was swimming through the water with that branch. I just know it was brown, flighty, and small.