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Metal Gear Solid Disc 1

Abridged remake of the entirety of Disc 1 of MGS1
-QRF
-destroy objectives
-retrieve Meryl.

Next-Generation Special Forces led by members of unit FOX-HOUND occupied Shadow Moses Island, a remote island off the coast of Alaska.
They've presented Washington with a single demand, and they say that if it isn't met, they'll launch a nuclear weapon.
You're to investigate whether or not the terrorists have the ability to launch a nuclear strike, and stop them if they do. I'll let you decide the best CoA, I'm Counting on you snake

And, I'll be frank, a person very dear to me is being held hostage, my niece, Meryl. Please Snake, Free my niece Meryl, She may be able to provide some support too

That base must have some kind of ventilation system to recirculate the air. There should be air ducts around there. They must need a lot of power to run the base. There's probably a diesel generator somewhere, and since they require oxygen, there must be openings for that too.

Utilizing the hidden air vents is a good way to get in undetected. Also might be able to find allied soldiers such as Solid Snake or Grey Fox hiding around somewhere.
If you have played the Metal Gear Solid you know where they are
Snakes in multiple Cardboard boxes, under the bed of the empty cell, or another Meryl in the womans bathroom

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