John - the loops wrere spliced in to replace all those overhand knots that we could not undo!!! - but with the fishing boat we anchor at least once every trip and occasionally use a technique using a bit of kit known as an Alderney ring. Attached to a large buoy this method allows the lifting of the anchor by steaming uptide whilst the warp runs thru the ring - (hence the need for the spliced in loops so that they run freely thru the ring), the buoyancy of the buoy then pops the anchor out of the sea-bed and leaves it suspenede just below the buoy. Fraught with all sorts of dangers if you get it wrong but handy at times for lifting a heavy anchor in deep water.
Keith - sorry can't draw the proverbial straight line let alone the diagram. It is mentioned on www.powerboat-training.co.uk
under anchoring - wavelength but still no diagram
(who used to have a website but has just managed to break it completely!)