With permission from runner Hodgey:
"This is level 1 of my speedrun of the Deeper Dungeons expansion pack for Dungeon Keeper 1. Dungeon Keeper is a great game (despite being massively broken :D) and although there is a speedrun of the original 20 levels out there, I couldn't find one of the expansion. I'm not really a speedrunner, and in fact I'm pretty much a filthy casual, but The Deeper Dungeons definitely deserves a speedrun, so I'm stepping up to get the ball rolling. If you think you can do better than me... go for it! I love this game, and I'd love to see a good speedrun of it. Until that day, you're stuck with mine.
Strategy-wise I think this is pretty straightforward. The closest thing to an exploit used here is that neutral wall can be dug through, even though it can't be tagged for digging, so there's no need to spend time breaking down the door to get to the horned reaper.
- Dig to the central cavern, and also collect the level 8 horned reaper from the neutral torture chamber.
- Use the horned reaper to clear the boulders and break down the doors in the heroes dungeon, to get to the unfortified earth on the other side.
- Switch to an imp and dig to the blue keeper's dungeon.
- Switch back to the horned reaper and go straight to the dungeon heart."
