There's bass voices, deeper bass voices, and then there's the oktavist, who sings a full octave below the bass. Years of training are required. Here's an oktavist quartet.

This comment was posted to reddit on Jun 17, 2017 at 2:22 pm and was deleted within 10 hour(s) and 42 minutes.

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(1) Sunn O))) - Aghartha (2) Sunn O))) - Kannon 3	+1 - The way Attila (Csihar, from Mayhem) sounds on some SunnO))) tracks reminds me a lot of this. Check out this, for example. On this track it's really clear too. SunnO))) is amazing by the way, definitely worth a listen.
The Power of the Russian Oktavist	+1 - Jump to 01:20 @ The Power of the Russian Oktavist Channel Name: The Oktavism Channel, Video Popularity: 97.97%, Video Length: [04:47], Jump 5 secs earlier for context @01:15 Beep Bop, I'm a Time Stamp Bot! Source Code Suggestions

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