https://youtu.be/NwEjcHimA_I?list=PLob-jWpcs_yw8b0De4q9mVt_3Wwbde1Qg

Can you explain how is it possible that you could see through the fog of war?

Of course. I used a hotkey that remembers the position of the center of the screen. I remember the position in the fog of war where located generator. Then moved to an area where fog of war is absent. Took the constructor and prepared for the construction, pressed the hot key and moved to the memorized position. In this case, the game includes fog of war in a fraction of a second, maybe 0.1 or 0.2 seconds. During this time I manage to put the green building which makes investigation and cleans fog of war.

The most difficult part is surviving the first 10-15 minutes, until the big attack with the Goliaths, after that the attacks slow down.

The way I did it was by using Judas Warlord type Commanders, a lot of patience, and saving the game each time I made a small progress. Inching my way through the corridors y managed to convert enough enemy machines to increase my numbers, and by generating havoc in the enemy lines I avoided the destruction of my most valuable units. It is vital to use Scavengers as well.

The Fog of War was on, I simply explored the entire map, slowly, very slowly, by securing the entrances to the vaults I cleared.

This level requires your best strategies rather than your best tactics: the way you administer resources is more important than how you fight.

Also, by retaining control of the entrances to your strongholds, you will force Midian units to move in rows, going one by one towards your "guards", preventing them to spread and increase their firepower (basically you'll increase your surface area, maximizing your number of units while reducing theirs):

Furthermore, an easy way to stop the Midian Controller from generating units fast is by puting your own units on the factories' platforms. That way they cannot spawn despite being ready.

I hope this helps!