No rubber tire will remain buried. Most people, never having tried to bury a tire, are not  aware that one will not stay in the ground. In fact, if you bury a tire five feet below the surface, it will–under normal conditions–rise to the top in about ten  years.The reason for this is as follows:

The rubber tire, being resilient, is constantly pushing back against the soil around it. Since the pressure above the tire is less than below it, the tire has more success pushing up than it does pushing down. As this pushing proceeds, small particles of soil around the tire are dislodged and fall down through the cracks and crevices too small for the tire itself to fit through, a process that is accelerated somewhat by the slight movement of  the tire as it expands and contracts with changes in temperature. Thus, as the tire pushes upward and the soil around it slowly  moves down, the tire migrates toward the surface.

It’s the same with the human heart. What’s hidden away inside will inevitably rise to the surface!