S1:Have you laid the dunnage as instructed?S2:I think so.S1:What have you done with the bilges?S2:The bilges have been covered with planks.S1:Where did you find the dunnage planks? The planks you use are not dry enough.S2:I'm sorry for that. What else could we use for dunnage?S1:You could have used mats. Please don't forget to floor off each tier of drums with dunnage planks.S2:Sure. I see. Is single dunnage all right for this part of heavy cargo?S1:I told you to lay it in two layers with the lower layer athwartship and the upper layer fore and aft. Have you arranged some heavy planks at the bulkhead?S2:Yes, we have put some heavy planks at the bulkhead to prevent the steel pipes from shifting. Q1:What has been used to cover the bilges?