Hey, 1st Guide hope it helps!!!
make your way to road's end, head south to the place marked on your map, to make it easier though, have the Knoxxed Out mission active, at the end you should see the Crimson Armory door, head across to the markus guns and sell as much as you can, you'll know later, head through the 2 containers, up a short incline, go right a bit, through a corridor, use the elevator, short cut scene, then kill knoxx, you'll have devastators, medics, troopers to deal with, they are a pain, but you've dealt with them defore, so should be no probs, on your map head left, up some stairs, enter the code from the left: DARK BLUE, YELLOW, LIGHT BLUE, ORANGE. door opens, athena will talk to you, press the button, then you'll have about 2 minutes to grab as much gear as possible, sorted done, cheese mint comes up after credits!!!!,
If i've missed anything sorri, had to remember after the cheese mint popped up, memory bad, old age you know how it is!!!