Why use a bare conductor for below ground grounding instead of an insulated conductor?

Why Use Bare Copper Wire for Grounding? - E&S Grounding

conductor, Grounding & Earthing Below-Grade Electrodes, insulated, below ground grounding
What Is Electrical Grounding? - E&S Grounding Solutions
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What other types of grounding electrodes are there apart from ground rods? - E&S Grounding Ask the Experts
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What are some different types of grounding electrodes? - E&S Grounding Solutions
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How to Ground a Metal Building or Warehouse Properly - E&S Grounding
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