I think Oceana needs to get someone who knows what they are talking about. This is not a seismic survey, this is a Multi Beam Survey to map the sea floor. If she is getting so excited about this then she needs to get excited about every single depth sounder and fish finder in Belize.
Fish cannot detect sounds above 50kHz. Multibeam surveys are typically done in the 125 to 500 kHz range. Normal conversation is -70dB a telephone ringing is -80db. Multibeam surveys are typically carried out at this depth at 20 to 70dB.

Calling this anything other than a seabed survey is scaremongering, which as we have seen in the past Oceana is very good at.

Don't believe the hype, this is a good thing for Belize and will do zero damage.