Waterfront Storage

The Waterfront Storage is the second level of Unit 2 of Ground Zero, and simple as it was in the previous map, the things are getting more complex. From this moment you will start your journey among levels to scramble the Strogg communication systems.

The level consists mostly of warehouse areas, and features a large water pool with a underwater tunnel that can be used as a shortcut (as long as you don't drown). A restricted area of the level is accessible only to a Tank Commander, or perhaps someone who possesses its head.

Walkthrough
You spawn near the entrance of facility. You have two possible ways to starts this level - the first leads through the doors ahead and is filled with a bit more numerous Strogg resistance, and the second is quite shorter and leads through the tunnel in the water on the right. What is more, in the end of the tunnel there is a Railgun waiting for you to obtain it. Continue by going through the maze of the storage till you find yourself in the room on an upper floor with a blue key card guarded by Gladiator. Obtain the key card and now you will be able to open cargo doors leading to logistics.
 * Waterfront Storage for the first time:


 * Waterfront Storage for the second time (after coming back from Logistics Complex):

You return to Waterfront Storage from an opposite way you started it for the first time. Now your aim is to use the transport shuttle to get to the Tactical Center, but to do it you will first need to disable power because of security reasons. For that proceed to power conduit room and destroy two wall panles inside conduit to disrupt it. Now security doors are offline and you may use shuttle to enter Tactical Command.

Secrets

 * #1) When you first enter the "crate maze", turn left and you will see a dark explosive box. Move forward and jump to the left path of box tops. When you get back to the explosive box, blow it up to reveal a cell. Drop down and get BFG10K and two Cells, and the secret. You can also rocket jump up to this area (just watch out for the Guards that will be waiting for you).
 * #2) Further along the "crate maze" you will see a crate transporter. Stepping on the railroad will trigger its movement. Get on top of the crate that is being transported; just ahead, you will see a Megahealth, which is the secret. If you miss your jump or fail to get on top of the transport in time, you can rocket jump up to it instead (the transport does not come back). This is not really a bad choice considering the item of interest is a Megahealth and that there is a suit of Body Armor on the upper level just past here.
 * #3) Nearby the exit door to Logistics Complex, there are 3 crates and just to the left of those is a slanted wall panel containing 2 small square panels with black/yellow patterning. You will see that the black/yellow square on the bottom is different from the ones at the top, in that the patterning is facing the opposite direction; this is actually a switch. Shoot it to open the secret compartment on top of the crates, which contains a Defender Sphere.
 * #4) SECOND VISIT: After passing through the door unlocked by the Tank Commander's Head, look to your right; just across from the stairs, there is a grated wall panel, whereas all the other wall panels are not grated; shoot it to blow it up and reveal a secret area, with a Quad Damage.