Sunrise at the 15th of december

I hope it will be a fine day for everyone!
The bulge in the pond is not the Monster of Loch Ness but a piece of a large bag that has to stay at the bottom of the pond to store the overflow of the sewer when it's raining a lot.
Apparently the thing leads a life of it's own and most of the time you can see the bulges rising out of the water, especially when it's not raining....