Reports with SNR below -28 dB

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DL2WB
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Joined: 2010/09/03 - 12:20
Reports with SNR below -28 dB

K1JT's homepage states "The [WSPR] program can decode signals with S/N as low as -28 dB in a 2500 Hz bandwidth".
In the past I saw spots with an SNR down to -31 dB.
How does it happen?