From Gamers.com:
As a final note this week I'd like to share the following information with you all. This will be life changing to some of you...and of absolutely no consequence to others; but take it as you will. Are you sitting down?
Yes?
Get this: Mr. Driller is Dig-Dug's son.
He's Dig Dug's son!
I know it's really frickin' geeky, but there's something enormously cool about that. How do I know this? Well, it's all buried in the back-story of Namco's recent Japanese-only release for GameCube, Mr. Driller Drill Land. People on GameNow magazine who know people that can read Japanese inform me that this life-altering information is shown on a character selection screen in the game.
No doubt we'll never ever see the game here in the U.S., but somehow it's comforting to know this information.