Wanders the center of the earth

The mutant creature, weakened by lack of radioactive materials to absorb, had wandered at the center of the Earth for a timeless time.  Driven by an instinct that told Godzilla that, somewhere ahead, sustenance could be found, the monster pushed on blindly.  But even this mighty beast’s unnatural biological systems were taxed to breaking by the harsh environment of the underground world.
Weird pressures assailed Godzilla’s senses.  The monster’s ears ached, and his lungs burned.  At times all oxygen vanished, and Godzilla was forced to draw from his radiation-charged cells the power he needed to press on.
But now, after years of aimless and fruitless wandering, much of that stored energy--gained in the heart of a nuclear blast--was finally depleted.