Now we used to clean the bottom up cos  used to be a big boiler in the dredger and erm we used to close down every six weeks, which they used to call blow the boiler down, that mean that they open the valve and the heat used to take all the water into the river, so er, that used to be blown down Friday night, come Saturday morning we'd start at six o'clock and chip all the fur off inside the boiler, cos the boiler was made with all  and what we call the crown, that used to be the two furnaces, cos they're double the big boiler were a double furnace and we had to chip all that fur off them, well it used to take us now from six o'clock in the morning or say seven when we got there  had to go down the tug and er go down the tug and erm, then we go aboard and strip off.