Black rubber pipe hanging loose under body

[Peter Michaels]

Hello i noticed to day a finger-thick black rubber pipe hanging down underneath the body, just next to the left of the right rear wheel.
I haven't noticed this before, the pipe is about 1/4 of an inch thick and hangs down maybe 6 inches.
But i cant see where it connects.

I hope its nothing dangerous for driving

Many thanks

2002 C-class Avantgarde diesel T Wagon

 

[KWER]

Drain pipe from inside of the fuel filler flap area. Open the flap and you should see a hole towards the bottom of the internal body moulding to let any water flow down