How good is it for Underwater camera usage (video and photos)

How good is it for Underwater camera usage (video and photos)?

Has anyone had an experiences taking under water photography or video footage? One of the only reasons I would assume anyone bought this phone (being far inferior to others in the same processor segment ) would be for the waterproofing.

I would really like to know since the Z3 and Z2 threads had lots of issues with waterproofing, breaking under water, as well as issues with not working after the water drop or drive.