Ya the audio on my atc9k isn't the greatest, sounds like air bubbles was coming out of the camera, although I didn't see any coming out. I have some decent sound equipment so I could bring in better audio after the fact.
The shape of the camera makes it fall pointing straight up, and luckily it didn't fall over when it landed. Also liked that my son shot it from the deep end to shallow so you can see all the way across. A year ago it was cloudy, a month after that it was clear.
Song suggestions welcome. It's a bit windy today, and it may rain tomorrow so will reshoot it when the wind calms down. I like having clouds to see.