No many people know, but the great Italian climber was also a great descend rider.
Particularly for positioning with his tummy on the saddle and his crutch at few milliliter from the back wheel.
I would not suggest you trying, because need a lot of practising, and Marco(Pantani) had a lot of empty roads to do it in is native Italian region.
Also need a lot of courage to ride at 70/80 km/h (40miles/h circa) with the back wheel so near your precious part of the body.
Next interesting position
Maybe this one will be the next one?
I prefer the classic position with your hands on the drop and tuck in aero position. What about you?