Macbook Pro 13'' worrying Noise

Hey Community,

I've had my Macbook Pro for 9 months now, and two weeks ago it started making a really strange noise, and I simply don't understand what it is.

I've found a video which has the same problem:

http://www.youtube.com/watch?v=dG3SD7OAd1Y

Any help would be very appriciated.
Thanks,

Nic