A steadily increasing force which approaches infinity towards an unachievable goal.
For example, the speed of light. As you approach the speed of light, your mass increases towards infinity, time slows towards zero and your depth decreases towards zero.
The equation is the sqare root of one minus your speed squared over the speed of light squared.
What do you call the dynamic where a force or difficulty increases as you progress towards an unachievable goal because the force or difficulty approaches infinity?