(I posted this before 8:30, ,but for some reason my pingback didn’t work. Trying again:
First thought: Profound means deep, among other things, and that led me to my love of deep bass voices, which led to the basso profundo voice, which is really incredible. What you’re hearing in that video is the voice of either Vladimir Pasuikov or Yuri Wichniakov.
And just for fun:
I have no idea why everything is underlined!