Kristen Bell is enjoying her adrenaline-packed trip to South Africa.

Yesterday she tweeted, "Flew to south africa a few days ago...and as it turns out, cage diving w/great white sharks isnt as scary as you think!"

She later added, "i wasnt scared of the sharks - the cage made me feel invincible! i was more concerned w/the temp of the H20, which was frigid!"

Kristen stars in the upcoming film "Big Miracle" about a Greenpeace volunteer and a small-town reporter who go to extraordinary lengths to save a family of grey whales that become trapped in the Arctic Circle.