@DandyDon - yep, the engines were running when they arrived at the dock and weren't off at any point during the dive (drift diving, so they are ready to move at all times). I was using a freezer bag so they're thicker and hold up.
Thanks so much for the feedback. I'm still going to work on my technique on my tanks at home.
Thanks so much for the feedback. I'm still going to work on my technique on my tanks at home.