Gibbs and McGee got shot down over Russia.
The season opened with Gibbs and McGee escorting a freelance Navy Intelligence computer engineer out of Russia. Then their helicopter was shot down by a missile and crashed in the Russian Wilderness.
They both had to survive the wilderness and evade a Russian black market dealer (Sergei Mishnev) who had a personal vendetta against Gibbs and was intent on killing him before he got to the Finnish border.
Watch NCIS Tuesdays at 8/7c.