Yes, it's a strange breakage. Before the breakage I heard creaking noises when cycling uphill. First came the sounds only, when I pressed the left pedal. A little bit later it creaked too by pressing the right pedal. After 600 km of PBP I rode on a slightly sloping road with good cover. My speed was about about 50 km/h when it crashed and the rear wheel blocked. The right chain stay was broken! As the result, the carbon-rear-wheel and the rear-derailleur were destroyed. The frame material is carbon. On the foto you see the broken carbon fibers.
So that the waiting time until the rematch in 2015 becomes not too boring, there are between - Vologda-Onega-Ladoga 1200, - TransRussia 3000, - London-Edinburgh-London 1400