One of the big brains behind next year's BioShock Infinite walks us through the back story of this layered, alternate history shooter, another chance to (at the very least) see more footage of this exciting BioShock spin-off.

Irrational Games' Ken Levine explains the war between the Founders and the Vox Populi, the factions that have turned the once glorious flying city of Columbia into a globe-trotting disaster. Irrational peppers in some footage you might not have seen before, moments culled from our pre-E3 walkthrough of BioShock Infinite.

If you prefer your developer diary things a bit more action packed, perhaps you'd like to learn more about BioShock Infinite's skylines?

We're still at least five six months and change from the release of BioShock Infinite on the PC, PlayStation 3 and Xbox 360, so you'd better settle in for a slow drip feed of content from next year's game.