where do i find mark III in iron man 2?

The mark 3 suit is located in the siberian foothills. When iron man is finish the flying challenge they will ask you to pick 2 things you would do go with the gate mission when you finish the mission you will be in this place if you already played this level you will fight a boss after you exit the place. Donit exit the place and if you doint know what I'm talking about it has pipes and the walls look very dirty. If you just finished the gate mission and you just got in the place there be a big wide open space to another platform just jump down in the spaces and run across the very bottom. There well be a blue arrow press x it well ask you you if you want to fight in a very difficult challenge say yes notice it wont have a number of enemes to fight just try your hardest it is real hard of a challenge then you well unlock the mark 3 suit. Ill make another tutorial of the ultiamte suit

Second level close the sluce gate and go down when you go in side the door and there is a hard chalige beat with out dieing