Earlier quoted context omitted.
Did anything ever come of this? Were the ideas ever implemented in the real world?
Regrettably, the actual markers at the WIPP burial site are far more boring and government-y: https://commons.wikimedia.org/wiki/File:WIPP_Large_Surface_M...
A great video about Fear of Depths briefly talks about this: https://youtu.be/7MOKTU9tCbw?t=1299 (timestamped at 21:39 when they mention WIPP, but I highly recommend the whole video)