Set off at 7:15, but was stopped at the tunnel entrance by the “tunnel guard”. An opposite direction widebeam was coming through. It appeared eventually and I set off following another boat which overtook me just as I was pushing off. He seemed to be in a hurry. At the other end I followed to see his boat disappear in a dense cloud of blue smoke form his exhaust. Moment later he did an emergency stop and pulled into the side. The lock was ready for me and I was joined by a beautifully newly painted fuel boat. So with help we were down the locks pretty quickly. Then on to Barby arriving at 12:00. I decided to stay overnight as there is a lot of laundry to sort out!