Dick slopped away into the mist. They watched the rope uncoil, in fits and starts, for a couple of minutes – this meant Dick was swimming. Then it stopped uncoiling for a long while – Dick had found the anchor cable and gone to work! The mudlarks dabbled with rag-swathed oars, flapping those wings against the river's flow. Jack sat holding the rope, waiting for the three sharp jerks that would be Dick's signal. But no jerks came. Instead the rope went slack. Jack, assisted by brother Bob, pulled the slack into the boat. Ten yards of it passed through their hands before it became taut again, and then they felt, not three sharp jerks, exactly, but a sort of vibration at the other end.