Hrithik Roshan, who bowled over audiences with his mind-boggling stunts in "Krrish", gets even more daring in "Dhoom 2".

He is shooting the climax of "Dhoom 2" in Durban and says he is going through one of the most exhilarating experiences of his life.

"You cannot even begin to imagine the feeling of snow-boarding a steep mountain over here in Durban. As you hurl down a slope you've no clue about where it's going to end. At that moment you forget all your worries and joys. It's the most exhilarating experience in the world," Hrithik told IANS over telephone from Durban.

Though Hrithik took a while off to learn snow-boarding in Durban, he still wishes he could master it to perfection.

"We haven't really had too much time for me to practise all the stunts before facing the camera. I wish I could master them a bit more."

So, are these much talked-about stunts in "Dhoom 2" as daring as the ones in "Krrish"?

"Oh, far more daring. Allan Amin and I are working on some of the most audacious stunts ever seen or rather never seen in our films. I don't think audiences have ever seen such action. Yes, they're risky. But I'm taking calculated risks. You can't cross frontiers until you take a risk."

Hrithik was in Namibia and now he is in Durban shooting the climax of "Dhoom 2" with Abhishek Bachchan, Aishwarya Rai and Uday Chopra. Bipasha Basu has just left.

Hrithik is missing his wife and son very much in spite of his busy timetable.

"And if you ask me whom I miss more, I'll have to say Susanne. I'm so used to her being there with me on all outdoors. Every day feels strange on this schedule. Not that I miss my son any less.

"I couldn't subject such a small baby to those painful vaccines and inoculations. Susanne and family are in London. I might join them there for three days after my schedule in Durban. And then we'll all return to Mumbai together."

After playing the super-hero in "Krrish", Hrithik is having a ball playing a grey character in "Dhoom 2".

"I can't remember the last time I had so much fun shooting a film. Believe me as far as action scenes are concerned I've crossed another threshold with 'Dhoom 2'."

He says he enjoyed the heart-in-the-mouth stunts he has been doing for the last one week. "I'm having a really great time. There're so many new things in this films. I had to train myself in different skills. I had to learn roller-blading, snow-boarding, sand-boarding and of course stunts on bikes."

Hrithik, however, preferred to remain ambiguous about his colourful role in "Dhoom 2". "I can't say much about my character. He's grey but not in any obvious way. It isn't exactly about being a villain. And my performance is certainly not stunts alone.

"No Hindi film can work without the sensitivities and emotions required. 'Krrish' had them and I believe 'Dhoom 2' will have them too."

The actor, who returns to Mumbai at the end of the month, is overwhelmed by the feedback to "Krrish" in South Africa.

"They all love the film here. Virtually everyone seems to have seen it. It's a great hit here. I just want to see how far it'll go. I wish I was back home to see the impact 'Krrish' is creating. Never mind. If I'm lucky I'll enjoy the success of both 'Krrish' and 'Dhoom 2' together."