After using the generator in a small building, bring it to the final courtyard, use the microphone in a room, then put the generator next to the tank, jump on it carefully, then take it with you and put it next to the upper floor, jump on it then go to the right, run and jump across the wall, then climb the stairs behind the helipad, wait for several minutes and the chopper will pick you up / you'll finish the mission. There's no other way, since the map hasn't been updated for the gate to open.

whats going on final rescue? when we ready to escape but the door havent open totally, it said we fail to survive. thats stupid

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I love the details on the map. Its been here forever and it will always have remarkable art!