It was pretty cool. It had extra valves and stuff...
An orchestral scoring class I took included presentations from professionals on various instruments. Of those tuba day was probably my favorite. Come to find out, the super-low notes metal bass players have been chasing have been available on tuba all along. Dude busted out some notes way below the range of a grand piano, and they were LOUD. He explained that even lower notes were theoretically possible; the limitation wasn't within the tuba but rather the limited amount of air a human being can produce. For that reason I decided that tuba is the most metal instrument in the orchestra.
That and it contains the most metal...
I think it was Kirk Joseph, the Tuba/Sousaphone player, who had a few articles in the bass magazines some years ago. There's a whole New Orleans/Mississippi scene with Tuba playing the role normally associated with bass guitar or upright bass. Really cool stuff. Thanks for making me remember.