Time to go fishing down a 4 inch pipe.
"If a tool is lost or the drill string breaks, the obstruction in the well is called junk or fish. It cannot be drilled through. Special grabbing tools are used to retrieve the junk in a process called fishing. In extreme cases, explosives can be used to blow up the junk and then the pieces can be retrieved with a magnet."
Ann: Operational Update - Myall Creek 4A Well, page-4
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