Big Oil Loss

Hi, guys.

you've been my last hope. My A8 has a huge oil loss. In the middle of the ride it smoked at once, then I immediately switched off the engine and I am to the side, while I already left an oil trace. After stopping, I removed the engine cover and the underrun protection (thanks to the on-board tool). Above it is so dry, there is only minimal what (probably rather distributed by the fan). But on the driver's side, there's a loss somewhere at the end of the engine. If you start the engine now it sounds like a gear wheel runs dry, the engine oil level is from just below max to min. and within 200m.

Are there any oil pipes running back there? If so, how do I find them best??

Please help me, I depend on the car.