Stuck, impossible to enter in Black Trench

[Exxaxion]

Hello, anyone have a idea to get rid of my bug.
I will explain what happened : at the very begining of the game i kinda fell on the north of the map where a locked door is (lot of water around), need to climb a ladder which is half in water to come back where the 3 floor elevator was.
I continued my story and now I'm at Darak, the icon show directly at this place where i fell few hours ago, i cant open the Greenish door, the cutscene dont appear.

I dont want to begin back as i have farmed like crazy to upgrade my town and stuff.

[H0b0t]

The fight takes place at the bridge above, not at the area you felt.
You need to make your way through by taking the path north of the whisper point between, the hunters firecamp (father and daughter) and sacrament's gate.

[Exxaxion]

Never fighted Darak before, but weirdly i have access to buy house already, normally they asked me to see again the church woman, but i dont found her, so i gone to where the daughter of governor was and the other character gave me the quest to kill Darak at his bastion

[MPN64]

The last whisper before the first boss go through the water and through the cave and you will have another whisper. From there continue and a big gate that was closed before is open. There you will have a first fight with Darak then some additional quest stuff before entering the Black Trench.

[Exxaxion]

Ah thank you both, i did go to this cave but i didnt pay too much attention i thought it was a dead end. I will check back
Thanks again