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May 25, 2017 at 3:34 comment added user126422 Ok, got it, I thought you meant that a signal could travel across the black hole! (well, in a rotating black hole it actually can, I believe)
May 25, 2017 at 3:23 comment added Bob Inward. Inside an event horizon future timelike directions point towards the singularity, such that all trajectories will (eventually) hit the singularity. Now as to the form of the actual equation of state of fluid inside a black hole (either made of normal matter or more exotic hypothetical stuff), the speed of sound might take on more interesting forms.
May 25, 2017 at 3:10 comment added user126422 Does this answer make sense at all? In what direction would sound travel inside a black hole?
May 25, 2017 at 2:47 history answered Bob CC BY-SA 3.0