Yeah, that area got a bit darker than we intended to. The generator on the right turns on a buzzing sound and lights that show you where to go. The door is under water (pretty visible though). Thanks for the feedback!
i found the door underwater with purple light but it was shutted. did i miss anything than those 2 levers in same room?
no you didn't miss anything in the dark hall. In the room with the shut door there is another way that enables you to open that door