Zerocarpileup

So I didn't notice I was on a high curb the other day and bottomed the front end of the car out. I heard a loud hissing. My suspension ride height was fine but im now getting a Airmatic suspension error on the dash.
After inspection I realized that the airline that's connected to the bottom of the silver tank has broke. Looks like I smashed the nut that holds the air line in was smashed and line was severed.
My qustion is, What single line is going right into the bottom of the tank? Theres only one. Also how could repair this