I found the entrance, that little dark hole (pretty neat entrance, props to the soon-to-be-dead builders).
I raked off some of the strips of bark and found lots of little white eggs which I mistook for yellowjacket larvae. I was a little on edge because my first strike initiative didn't produce a critical hit and one yellowjacket managed to sting me on my neck, fucker. As I slapped at him, I hit him... and knocked in down the neck of my shirt, where he stung me again, double fucker. He couldn't fly away anymore so I crushed him. This is why I was wound up. You can see the better part of can number one coating the wood, murdelizing countless unborn ants.
I raked away the rest of the bark and lo, and behold! Paydirt.
Gloved hand for scale.