I was watching Neil deGrasse Tyson video, in which he describes a scenario of colliding black holes. He mentions that when two black holes collide, there is a huge distortion of the space time between those two black holes as each of their even horizons intersect (i.e. each black hole has passed the others' event horizon). He says that, according to Einstein's Equations, the severely distorted space time that "there is a path you can take around two moving black holes that haven't quite collided where you can end up in the past of when you started that journey." From what I understand, light can't escape a black hole because the space time loops back in on itself so to say so that there is no path out, making the escape velocity larger than that of light. However, when two of them collide, the space time gets even more distorted. I was wondering: how exactly is it possible that space time can be warped so severely that it can allow for a method of time travel? Video: http://youtu.be/CAD25s53wmE Thank you in advance for any comments.