To remove the coal from coal fire bunker cannot be put back into other bunkers when at sea. As the bunkers are filled from outside above the water level with seal off doors. To open a coal bunker door from below you will only land up with tons of coal on top of you . All they can do is to wheelbarrow down to other boilers. There is talk of the ship a list to port! When looking at the layout of the bunkers one can see the bunkers are off set to port. I guest the trimmers delivering the coal to the boilers normally start on the port side first. With coal on fire on the starboard must be coursing bit of a problem to keep the bunkers level. Mike.