I just noticed with my paladin that, underwater, you can cast and then press space to emerge on the surface, your spell won't be interrupted.
But if you try to press X to go down in the water, the spell will be interrupted.
I don't know if this is an exploit, but I thought I had to try to contribute.
Thanks for your time and sorry for my bad english.
Bai
Edit: If you want I can record it. If it's working as intended, please remove my topic.