I don't think it is something you should take to the police, but I do think you should complain, and definitely change teacher. (this is unless she really held/forced them under in anger) I am always incredibly impressed at how my children's swimming teacher is with the one very nervous child in their class. His progress is incredibly slow, and you can see how frustrated she gets, but she is unfailingly kind (although firm) with him. To be honest I'm not quite sure why his parents make him do it, as he obviously hates the lessons. After your dd's experience I would think about taking a break, or if you really want her to swim now, try finding some individual tuition for a while. Otherwise can you not find somewhere which only has shallow water to take both children? I have been taking both of mine for a few years now, to a couple of pools with designated shallow pools for small kids and so long as they are well in their depth, having two littlies isn't too bad (just keep the sessions short). I think that it is really important they think of playing in water as fun, otherwise they may think of their lessons as a trial that you are putting them through. My little girl also hated to get her face wet when we started classes about a year ago, and the teacher recommended spashing her face and practicing blowing bubbles in the bath to help her feel more confident, and it seems to have slowly done the trick. She's now six, and we can happily go to the swimming pool and play without me feeling that she is clinging on like a limpet. Good luck with the next teacher!