As is nicely visualised by it's Penrose Diagram, e.g.

https://jila.colorado.edu/~ajsh/insidebh/penrose_schw.gif

Some PBS Space Time episodes featuring the Penrose Diagram (in order - the first two are from 9 years ago, the last from 6)

What Happens at the Event Horizon? - https://youtu.be/mht-1c4wc0Q

Escape The Kugelblitz Challenge - https://youtu.be/v3hd3AI2CAA

Mapping the Multiverse - https://youtu.be/4v9A9hQUcBQ

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greesil 7 hours ago | parent | prev | next [-]

I enjoyed this Veritasium video on the subject, which includes Penrose Diagrams.

https://youtu.be/6akmv1bsz1M

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moralestapia 8 hours ago | parent | prev [-]

Sorry man, that's not what this is about.

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Certhas 8 hours ago | parent | next [-]

It's not? Schwarzschild has a space-like singularity. That's the wiggly horizontal line at the top left of the diagram. If you are in the black hole you can't avoid hitting it. Seems to be exactly what the paper is remarking on.

	▲	DeluluDon 7 hours ago \| parent [-]
		[flagged]

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evanb 5 hours ago | parent | prev [-]

Yes it is?