After reading this thread, I made a few explorers as I went to war with Russia. Caused all sorts of havoc with them, too: pilligaing, then running around, then pilligaing again a couple turns later. Run across the mountains, scouting their foot unit movements.
Dig it.
I've never seen the AI make one: one more reason to use 'em.
Thanks for the tip.
Later!
--The Clown to the Left