When it was our turn to enter the dock, we had trouble in closing the gates. After a lot of heaving and pulling we finally managed it and started to let the water out of the dock. Thats when we realized that the gates were letting in water as fast as the water was draining away. Mick then had a brilliant idea. He asked us all for the ash out of our ash pan. He then poured the ash into the water where the leaks were and low and behold the leak sealed. Genius.