Mission: Impossible 2 opens with a sequence of Tom Cruise rock climbing as superspy Ethan Hunt, and his ascent up a mountain with no safety cables leading to speculation if the stunt was real. Mission: Impossible 2 marked something of a turning point for Cruise. Before the sequel, the actor appeared in a variety of genres, with his star power alone often enough to make a given film a success. With Mission: Impossible 2, he set out to make himself an action hero and performed several impressive stunts himself, but there is some confusion about whether Cruise did the rock climbing sequence himself.

https://screenrant.com/mission-impossible-2-movie-tom-cruise-climb-safety-rope/