What is the cheapest material to fill a large hole?

Could you please elaborate on what you mean by "cheapest material" and "large hole"? Are we talking about a hole in the ground, a wall, or some other surface? Additionally, what factors are we considering when determining the cheapest material? Is it purely based on cost per unit, or do we also need to take into account factors such as durability, ease of installation, and long-term maintenance costs? Without more specific information, it's difficult to give a definitive answer, but some common materials that are often considered cost-effective for filling large holes include soil, gravel, and sand. However, the most suitable material will ultimately depend on the specific circumstances and requirements of the project.