Sunroof drain leak??
 

My girlfriend's 2003 V40 has been getting damp on the passenger side during heavier rains for a little while now, however last weekend there was a good 1+ inches of water on the front passenger side floor. So whatever is wrong is getting worse. I figured it was the sunroof drain but can't find where the hose is routed. I ended up removing the passenger seat and the front passenger carpet. When I did this I found the water was also on the rear passenger floor. Also there was a hose running from under the dash along the floor all the way back and went somewhere behind the rear seat, I have no clue what that is but it seems the water lies along that hose. Coincidence maybe? I thought the sunroof drain would drain behind the front wheel. So basically I'm looking for a sunroof drain diagram, explanation for that hose, and any other pointers because honestly this is something I've never felt with before and is kind of overwhelming especially with how busy I am. Thanks all in advance