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" 'It looks like the signals we’ve picked up recently have been much weaker than the original signals we picked up, so that means probably we’re either a long way away from it, or in my view more likely, the batteries are starting to fade and as a consequence, the signal is becoming weaker,' he [Angus Houston] warned.
'So we need to, as we say in Australia, make hay while the sun shines.' "
DK-Series Underwater Locator Beacons | Radiant Power Corp
"Acoustic Output, Initial: 1060 dynes/cm2rms pressure at 1 meter (160.5 dB)
Acoustic Output, After 30 days: 700 dynes/cm2rms pressure at 1 meter (157.0 dB)"