How Do I Get to Gandara After I Have Completed the Docks Mission

Well, How do I? I have exploration there ^.^

You can get to Gandara explorable from the Pogahn Passage outpost. If you're coming from Yohlon Haven, Pogahn Passage is in the SE corner of Arkjok Ward.

Pogahn Passage is a mission outpost but you can enter the outpost before the storyline takes you there. Alternatively, you could wait until the storyline leads you there but that'll only happen if you choose Margrid the Sly over Master of Whispers.

I tried that, after I completed it, the gates to gandara were CLOSED. But then I did the Pogahn Passage Mission, that gave me the explorable areas I needed. This mission wasn't done because I had taken the Acolyte Jin path, rather than the Acolyte Sosuke path.
Question answered, thanks.

Do you mean Margrid the Sly or Master of Whispers path? Because from what I remember, you could do the entire game without ever having to choose an Acolyte.

You need to pick Margrid as your hero instead of Master of Whispers and follow the series of her quest, in order to do the mission No me No Kormir. Which will let you go inside the fortress again.