If I told you which very modern game includes a surprise Descent homage, that'd be a spoiler.
But if you really want to see what a Descent game would look like on the Xbox 360 (or the PlayStation 3 or PC), then I suggest you watch this short clip.
It's like 1995 came back, but with much better graphics.
If you don't know what Descent is,
shame on you study up. It's a PC gaming classic, a pioneering effort in 3D game graphics and free-form control. You were flying down corridors in the first-person perspective, man, and you could rotate in any direction! It came out in 1995 and spawned a few sequels. Not much since. It's about time someone brought this game back.
The Descent footage from this clip is via YouTube. The other game's footage is via my Xbox 360.