Two men are walking through the woods together and they come across an insanely huge hole in the ground.
The first man picks up a rock and tosses it into the hole.
The rock vanishes from sight, and neither guy could hear the rock hit the bottom.
The second man decides to throw a huge log into the hole.
After a few seconds pass, again there was no sound.
Both men, wanting to know how deep the hole is, spot an anvil and decide to toss it in, surely it would make a noise loud enough to hear.