Director Christopher Nolan has defended the sound in his film Interstellar.

Some viewers have complained that sections of dialogue are difficult to hear, but Nolan told the Hollywood Reporter that was intentional.

He said the idea was "to experience the journey the character is going on."

"I've always loved films that approach sound in an impressionistic way and that is an unusual approach for a mainstream blockbuster, but I feel it's the right approach."

In the epic sci-fi film Anne Hathaway and Matthew McConaughey's characters go in search of new habitats for humankind after Earth is devastated by an agricultural crisis.

The Batman and Inception director said he used dialogue as a sound effect at points "so sometimes it's mixed slightly underneath the other sound effects... To emphasise how loud the surrounding noise is."

"I don't agree with the idea that you can only achieve clarity through dialogue. Clarity of story, clarity of emotions - I try to achieve that in a very layered way using all the different things at my disposal - picture and sound."

Source: Press Release