I haven't seen any of the telecast yet as I got home from Germany last night. But I'm curious if anyone knows how many of these bunkers were original, and how many were added in the various renovations.
I only saw the course when it was new, and I don't remember the bunkers being strikingly different. Chris Hunt, who shaped some of the bunkers under the direction of Ron Whitten, told me that he had built some deliberately awkward hazards, but I don't remember that many of them, other than the one in front of the 15th green. I did see a few that I thought were different - and that might get washed out during thunderstorms.
We tried to do "trench bunkers" at The Rawls Course to protect the sand from wind erosion, but I haven't played it enough to know if they really extracted more of a penalty. After our work at Woodhall Spa, I've been thinking about a more penal style of bunkering for a new project we are planning, so I'll be curious to see the TV this weekend. Note, though, that Pine Valley's penal hazards didn't start a revolution, so I don't know why Erin Hills would.