Motorhead Easter Egg - The Digital Illusions Team

Run Motorhead, and start a Time Attack (although any mode will work), and choose Olympus as your track, and anything you like for the other options (like car and transmission).

Drive round the first corner, and you should see a part of the road where there is a bridge or something above you (in the rocky area before the road spilts). Just past the 'bridge', drive into the rock face on the right. Its difficult to explain exactly where the 'hidden corridor' is, but keep trying, and eventually you will find yourself driving down a tunnel, and at the end is a square room with pictures on the wall of the Digital Illusions team!