AC water leaks inside the car

Hi, please I really need your help as soon as possible, I have a water leak in my car under the feet of the driver, and it's a lot of water, I followed your steps trying to clean the drain hose but I found it was not clogged it's all ok, but from inside the car in the middle under the dash still leaking, now I think the problem is from the box which holds the water and then to release it to the drain hose short tube, I think but not sure this box is broken or something, my car is Tucson 2005. Please tell me what to do and how do I make sure of the leak place. Thank you