Well, this one is like Descent 3 demo 2 and thus fairly easy. It is also a good place to get used to rely on your Guidebot. Compared to Descent ][ it has a far larger influence on your way of completing the game. It always knows what to do next to fulfill the current objective so keep using it often. If you're not sure what to do next, take a look at the first command on the GB's menu; it will show you how to continue. In case you got lost in the mines simply ask the GB and he'll lead you everywhere.

I won't give you any screenshots for this level so you can try it out yourself. Simply read the objectives, deploy the GB and follow him through the complex. But before you fly off, shoot the floor right in front of your level entrance point; you'll get your first secret here and also a nice sight: your new Pyro! You can view your ship also by placing markers. The direction you look at becomes the viewpoint of the marker camera. Just press Shift-F1/F2 to get the mini-screen up and cycle through them.

The triggers for some obstacles (locked combustion chamber door, forcefield) are always very close, just keep your eyes open. Having reached the "reactor ring" you simply got to grab the passkey to gain access to one of these rooms and activate the data terminals by bumping into in each of them. There are some more secret doors in front of the data terminals!