2004 Mercedese S430 Airmatic red warning car too low on dash

Question

I had No warning other than a noisy sound like a motor running in front right of car after parking my car, the right front dropped low. I'm not sure if something several things that occured prior caused this : my car was driven by a family member and was backup too far into a pile of limbs when backing out of a driveway. Is there lines underneath the car in the rear that could have cause this ... I looked and see a black tube with no end on it underneath the right side of the rear. Please help if you can figure this out. Thanks