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I will make it real simple..

Can I, slide up in a truck.. of your own design.. No limits except those imposed by technology..

AND, ram a blade.. or some type of a seperator through a PVC or CLAY Sever Pipe in about a minute?

No limits except those imposed by technology.

The answer is yes, most of the time, depending on the soil and location of the pipe.

Now, why would anyone want to do this?

I will make it real simple.. Can I, slide up in a truck.. of your own design.. No limits except those imposed by technology.. AND, ram a blade.. or some type of a seperator through a PVC or CLAY Sever Pipe in about a minute?

Once again, the answer is no. And how would you retrieve the contents without digging down to it anyway? Also how would you know where the sewer pipe is? At my house, it's in the back yard on a slant and it shows up on the wrong place on my survey. OTOH, sewer lines are rarely 8' down.

As for the "War on Drugs", how would this keep the police from illegally seizing private property without a warrant or an established crime?

Sure

A hydraulic pier drill (mounted to the chassis of the truck) could give you an 8' hole in less than a minute - right through the PVC or clay pipe. Then you could jump into the hole and, with your trusty sledge hammer, drive any size steel plate you want into the exposed ends of the pipe.
By the way, you won't have to design the truck. You can rent one at the same place Tim McVeigh got his

Sure

A hydraulic pier drill (mounted to the chassis of the truck) could give you an 8' hole in less than a minute - right through the PVC or clay pipe. Then you could jump into the hole and, with your trusty sledge hammer, drive any size steel plate you want into the exposed ends of the pipe.
By the way, you won't have to design the truck. You can rent one at the same place Tim McVeigh got his

AND, ram a blade.. or some type of a seperator through a PVC or CLAY Sever Pipe in about a minute? It's a completely unnecessary complication, and there's a much easier way: just run a probe to where the sewer line exits to the main. City crews run sewer probes all the time -- we once had them run their "sewer cam" up our pipe to see if the line was broken (no, it wasn't).

Of course, the whole idea is completely useless in multi-unit dwellings.

Can I, slide up in a truck.. of your own design.. No limits except those imposed by technology.. AND, ram a blade.. or some type of a seperator through a PVC or CLAY Sever Pipe in about a minute?

IMHO, the answer is yes. But there are other considerations. Ditches for sewer lines are dug by the contrator with a backhow- a ditch 2-3 feet wide. If you plunge your blade into the softer dirt of this ditch, and it then runs into the harder unexcavated side wall of the original ditch, your blade will most likely be badly bent. Count on that happening sooner or later. Also, many plumbing contractors use this same ditch for the water service line and the gas service line too, depending on how economical it is according to where the city service connection for that lot is. You'll certainly bust some other lines sooner or later.

Also IMHO, the blade capable of this will have to be a pile driver type, with each successive hit driving it say a foot or so into the ground. Probably compressed air driven, and almost certainly loud as heck.

Have fun.