U2L2

The object of this level is collect four power cubes to power up the Warehouse level. You also accomplish the unit objective here, which is to  destroy the Strogg logistical train.

U2L2W1 (secret here)

Shoot down all opposition in this first walkway - also remember to look across the opening. Drop down into the open and head to your left. There is a small, gray area that resembles a door. Once approached, it will open to a secret area with combat armor. Return back out and step on the platform to elevate you to the surface. When you enter this door, hit the green button right away to drop a crate on a Beserker’s head! Then jump down and kill whoever is left - most enemies will charge you from underneath where you were standing so watch out. 

U2L2W2 (secret here)

Hit the green button and enter the small platform to elevate you where you first were, overlooking the crates again. Now plant yourself along the dotted line so you can hop onto the moving crate. Allow it to take you into the compartment in the wall but remember to crouch when you get close. This uncovers another quad damage secret.
Exit the crevice and jump up onto the crates on the other side of the room in order to activate the yellow-coded door underneath you. Enter in the warehouse space and blast everything in sight. Be forewarned - when you go for the chaingun, a box will blast open with a Beserker or two out for blood. Hop on the platform and snatch the first power cube. This will de-activate the red laser grid so you can walk past on the walkway above.

U2L2W3 (strategy)

Enter the next warehouse and pick up the jacket armor. Activate the platform and it’ll lower you to another level. Activate the cargo by pressing  the button on the wall and follow it through the door. Now step on the moving tram and kill everyone on the other side - see the train? Bingo! Jump across the tracks but don’t touch them or you’ll be electrocuted. Once on the other side safely, hit the first green switch to send the train through the wall - your primary mission is now complete. Now, the second switch on the other side of the wall can be accessed, which raises another power cube. Jump onto the tracks and follow where the train smashed through the wall. On the ground, there will be another green button. Step on it to raise the ladder - this will take you to armor shards and another power cube. Jump into the red area when it opens in the wall and you’ll find a grenade and a small opening you must crawl through. 

U2L2W4 (secret here)

Take out the enemies on your right (higher up), then climb the ladder or activate the platform to finish the job. Watch for the Gunner’s grenades! At the bottom of a stack of rust-colored boxes is a gray box. Shoot it to uncover some mega-health. This is the last secret for this level. Touch the green panel in the far corner of this room to open up stairs leading down. Step on the platform to be lowered again and try to jump onto the crates to grab the ammo and health while fighting off the vicious Strogg. 

U2L2W5 (strategy here)

Use the small ladder to climb to the opening with another green button. Press it to activate the mechanism to the right and hop on for a ride up.

U2L2W6

Exit the door to the right and kill the Enforcer to recover the last of the four power cubes. Enter the bright warehouse and collect what goodies you can, then head back out the door the way you first came. You can now enter the door from the beginning of the level you weren’t able to open, and go back to the Ammo Depot.