This, or something very similar, was posted a long time ago here. I cant find it anymore, sadly, but it was a backscatter-based communication platform that used

This, or something very similar, was posted a long time ago here. I cant find it anymore, sadly, but it was a backscatter-based communication platform that used very low power in the underwater part... And illuminated that with 210 dB sound. I guess this is similar, and equally disruptive to sea life.