There is a strange place in Saint-Petersburg. Every underground explorer knows about it, but nobody actually was there. It is the Admiraltejsky canal, often called as the Konnogvardejskaja tube, put in the sewer even in 1844. Now the faces of this sewer are backfilled (pic 1). But once Muatbor and Vasily had found an appropriate manhole and got into the sewer. Yes, it exists, but now is partly filled with shitty silt. So man cannot walk in it, only creep on all fours and not everywhere, because in some places the silt is too marshy. But nevertheless it is a beautiful old brick sever, the pearl of underground places of Petersburg. The main sewer has also an attachment which is also old, brick and nice. So here are the pictures made by Mutabor (pic 2–13) and Vasily (pic 14–24).