In 13:21-33 we find the spies returning with a fairly negative impression and report of the Land of Israel. I find it astounding that being their report is so negative, why is it that none of their experiences are related to us? What happened to them that they had such a negative impression? The passuk simply says (aside from the one passuk about cutting down the cluster of grapes), "and they returned from spying out the land at the end of 40 days."
One would think, based on the negative reports they came back with, and the attitude that they are so against going into israel, that they must have experienced such traumatic and frightening events. Seen horrible things. Why does it not tell us a single negative event from their days of spying?
I suspect it might be because they did not experience any such negative or traumatic events.
I think their trip through the Land of Israel was probably relatively quiet and uneventful. The negative report was contrived based on their agenda. They had an agenda to recommend against going in, for whatever reason (many commentaries discuss their agenda).
It was not a result of any bad experiences or anything negative they might have seen while spying, just in order to justify their agenda.