Freesound Forums

Hi o/ I'm new here so I'm really sorry if this is the wrong subforum
I'm collecting SFX from a show called CODE LYOKO, which use pretty much free sound effects found anywhere on the internet. I found pretty much all of them, except for one, and I've been looking everywhere for the past 2 months without any luck. I know it's a free sound effect as well because I heard it in other cartoons like Winx Club and fantasy tv shows like doctor who.

If you guys could find it I'd be so thankful!
It's this sort of "humming" that plays inside the tower. https://www.youtube.com/watch?v=DqBBMSS2bno&t=34m54s