Looks like a physics issue, i would try to disable SLI, set PhysX calculations to CPU instead of GPU, start the game and try to crawl under this pipe again.
By the way, i think you'll achieve better frame rates in this game disabling SLI and dedicating the second GPU to PhysX.
Wow that is pretty lame when you have to switch off physx just to overcome a bug. Switching off Physx is like switching off the game's biggest tech selling point.