This bothered me as well. Even "numbers with decimals" would have been much better.

Obligatory reference: http://khaaan.com/

Maybe the creature was filming the ROV and it will post it to SquidTube.

True that. Take any point in space that "seems" empty. In reality, it's crammed with a hell lot of rays, waves, particles, and that's what WE know. If we could produce a device that converts all those waves into sound, we would be listening to a chaotic mess.