Such humans appear to be like animals now because they are satisfying their physical urges and nothing else. Will Damron has provided the high pitched voice to this catastrophic situation which suits it very well. The journey starts and the survivors move in the direction of an alien planet so it can be said that it is like a leap in darkness because the end result or the outcome is not clear.
The author has talked about a span of five thousand years which is quite huge to imagine. In a nutshell, everything in this book is tough to imagine but the author has painted it with easy words so that the listener can easily become familiar with the thing. Don’t try to get to the conclusion first because haste can destroy the taste.