Crossing a Black Hole's Event Horizon Explained
PBS Space Time · Explainer · YouTube title: What Happens at the Event Horizon? | Space Time | PBS Digital Studios
Why it's here
Commenters call it a short, clean, visual explanation of the infalling-particle question and of Penrose diagrams.
What it covers
PBS Space Time explains what happens as you approach and cross a black hole's event horizon, using Penrose diagrams and light cones as the tool for understanding spacetime there.