Maybe not the most significant one the world has ever seen but important enough to Kryptos fans.
So take the X’s out and put in some stops:
IT WAS TOTALLY INVISIBLE HOWS THAT POSSIBLE ? THEY USED THE EARTHS MAGNETIC FIELD (STOP) THE INFORMATION WAS GATHERED AND TRANSMITTED UNDERGRUUND TO AN UNKNOWN LOCATION (STOP) DOES LANGLEY KNOW ABOUT THIS ? THEY SHOULD ITS BURIED OUT THERE SOMEWHERE (STOP) WHO KNOWS THE EXACT LOCATION ? ONLY WW THIS WAS HIS LAST MESSAGE (STOP) THIRTY EIGHT DEGREES FIFTY SEVEN MINUTES SIX POINT FIVE SECONDS NORTH SEVENTY SEVEN DEGREES EIGHT MINUTES FORTY FOUR SECONDS WEST (STOP) LAYER TWO
So if you need to brush up on how to write a telegram properly, go ahead and then come back.
Nothing about this message actually makes much sense. We don’t know the subject (what was invisible), we don’t know who “they” are, what the information is, how something is transmitted underground (besides burying it), was the message to or from WW, and whether LAYER TWO is meant as a noun or verb.
Layer two could be the second layer at the location where “it” was buried, the literal 2nd layer of Kryptos or a cryptographic directive to layer two.
The problem with K2 is that it lacks a lot of context which results in a lot of potential meaning being lost. Perhaps it isn’t quite finished being solved?
UPDATE: How they used the earth’s magnetic field is through ionosphere hops (DXing)