It is a recording specially made to simulate the sound of New York being blown up. For this, a life-size replica of New York was built at Wanstead and blown up.
13 seconds sound clip from The Goon Show, Series 6, Sale of Manhattan classic radio program.
You can hear this line at 00:27:48 in the radio play.
Quote context
[...]
- What? I'm rich! Rich! I'm rich!
- No! No, wait, wait! Hello, get me Bluebottle! Don't light the fuse!
- And all this just for one pound a year.
- Alas, New York, all destroyed.
- Wait, what is this little blackened twig lying prostrate in the gutter? I'll pick it up.
- Rest in pieces, little nurk.
[...]