Hi Jacob, 
you are the first one but I have been talking to other scientist 
about their projects. Right now we are recording and hopefully automatically detecting Eurasian otter (Lutra lutra) vocalisations.
Did you find out why your files were empty or was the sound level just too low?

Greetings from Austria,
Robin

Hi Ian, are you in Brisbane? We're based in Brisbane also. You can borrow a few BARLT and Aquarian Audio hydrophones for a little while to compare against your hydromoth. We have localisation also using the inbuilt GPS and software to time align the calls. It'll probably save you time. You can run a microphone and hydrophone on a cable on the one recorder.

Hi Ian, 
the otter detection works great but we recorded the otter calls with the Hydromoth outside of the water. Do you plan on recording Platypus underwater? 

Hi Ian,

I have hours of an unidentified creature recorded during overnight recording sessions with mutliple hydrophones. We think it is platypus but there is nothing to compare against that isn't from captive sounds. I am waiting on the Hydromoth to become available again so I can do longer term monitoring.