hmm, so i did some googling on what was said over the radio transmission. It looks like there's a lot controversy about this and no clear answers.
First of all, the captioning for the broadcast read "there were no survivors...".
However, a clip of the show that's posted on the Lost website appears to be very different from what was shown during the actual broadcast. On it, the person on the other end of the transmission echoes Boone (but in a different, less excited and more monotone voice) "Hello, we're the survivors of Oceanic Flight 815."
Relistening to the broadcast, both could make sense and its possible the show purposely jumbled the words in order to generate a little mystery about it.
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