Well, I don't play with mods, but if, I would first remove them and see what happens next. About the moodlets for diving I'm not quite sure what you mean. If your sim doesn't have the iron lung, you see moodlets for comfortably breathing or not. Once they got the iron lung, those moodlets won't show any more - which makes sense in a way because you can - theoretically - dive forever. The exploring of the caves is indeed a known glitch and I don't know any way around it. I struggled yesterday myself and tried with and without focusing the camera on my sim - it didn't make a difference. I usually wait the decompressing time and then go back immediately and try again. In most cases the 2nd try works.