I enjoyed this thread, and I also watched the ship go through various locks.
I love the Summit and I sailed on her in 2016 to Bermuda (with Captain Kate) out of NJ and then I sail on Summit last year from Boston up to Canada and ship stayed overnight in Quebec City. We even got to go to Bar Harbor since this year only very small boats are going.
Now I am looking forward to meeting Summit again for yhe 3rd time in Vancouver to sail up to Seward.
As for the PC, I went through once on small excursion with HAL after just doing Gatun Lock and they were building the new canals off to the left. Then I was lucky to sail on the NCL Bliss in 2018 for her first trip through the PC and at that time the largest cruise ship and we did the new locks.
I found the older locks more interesting.
Here is a photo of a small excursion through the locks and how interesting it is to be way down
So, I enjoyed this thread for both PC and the Summit. Thanks for photos and I agree some of the best one are in the back of the ship. I was lucky to have perfect weather. sorry dude.. Bye have a great sail up to Canada.