Divers often swim past some of the best passage, without a glance sideways. Examples:

The Catacombs (no fixed lines, so run a reel).
https://www.youtube.com/watch?v=fEzlqh5Ne8k

The enchainment of the Lips and Keyhole Bypasses.
https://www.youtube.com/watch?v=TZK5MGfEC5I

The Godzilla Room.
The Wormhole.
The Ice Room.

Other suggestions?