According to Kruskal–Szekeres coordinates, space and time switch their roles inside a black hole. A Penrose diagram helps to understand the situation.

How Time Becomes Space Inside a Black Hole | Space Time

PBS Space Time

Mar 30, 2017

• https://www.youtube.com/watch?v=KePNhUJ2reI
  • 15m28s

WP: Kruskal–Szekeres coordinates WP: Penrose diagram