I wish they had written or mentioned at the beginning that some of the scenes can be upsetting or shocking for sensitive viewers. Not knowing anything about free diving or about the story, I felt myself unprepaired for what I have seen. Can be a beautiful story otherwise.
When I checked the maturity (age) rating after seeing the first few scene, I was not sure if I would let a 13-year old see it, at least, not without guidance.
Such a pity! Because I think there some beautiful stories to be told, but some would need a more careful or attentive warm-up.