Over the years I have trolled lures and suchlike behind various boats for thousands of miles and one thing I have learned is that sometimes you catch fish... Sometimes you don't!
With this rig, to be truthful, you mostly catch fish...
What is so cool about it is that it is cheap to put together, dead simple and did I say it caught fish? Plus what is even neater is that there is no real formula to this sort of rig and all you need is 150 feet of line with a lure/squid/whatever on the end a sabiki rig and a planing board or diver to get it all down below the surface... The picture pretty much says it all.
Like I said, dead simple!