Kate Winslet: 'James Cameron's Titanic was tough'

James Cameron's Hollywood blockbuster, Titanic, is being re-released in 3D - 15 years after it first hit the big screen.

The film's leading lady, Kate Winslet, said that working on the Oscar award winning film was "really, really tough".

She told the BBC's Tim Muffett that Cameron was "a very demanding director of his actors and his crew - because he wanted the best".