Let's say you have two entangled particles. Is it possible for one of them to fall into the event horizon of a black hole and the particles still be entangled? Or say the two particles are far apart and the universe undergoes extreme expansion (just after the Big Bang, say) such that they are still entangled but no longer in each other's light cones? If this were so, does the entanglement mean you now have some information about part of the universe which GR says you can't? Also, how can you even tell if the particles are still entangled?