 and some hollow thuds that sounded like bunker doors. It's a longer story that I have time to tell. On the way out, we were followed by an old UH-1 Huey helicopter with a red lamp on the bottom. Now, that canyon is very narrow. To fly a helicopter that low through it, it's not impossible, but it takes great skill, especially at night. And when we were followed out, this helicopter stayed with us until we got...