A Double Mouble Twistttre 9000 (Deep Level 4)
Deep Level 4 is when you're so deep in something it’s like you've been swallowed whole by a giant fish and it's also singing you a lullaby.
Deep Level 4 is like being in the middle of a fish's stomach and it's also playing a song.
Deep Level 4 is like being so deep you forget your name and your ex's name and your dog's name.
Deep Level 4 is like being deep enough that the ocean is now your new best friend.