R&H the movie and N.Ireland

I am working on an essay for music class, and I need some help.
During SBS on R&H when Bono speaks his piece he mentions the "H-Blocks".
First off, am I hearing him right? Is that how you spell it? And what
exactly are the H-blocks?

I know that somewhere out there can help me out with this one! So please
email me !!!!

Thanks in advance!
Erin

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