After the grading for the pool was done and the land was surveyed, the next step was for the excavators to actually dig the hole for the pool, which turned into a much larger challenge than expected, and also turned into a logistical mess since I was coordinating the various contractors from Vegas (in a pool at the Wynn, which was sort of ironic given that this project also involves a pool).
The excavators started digging, and quickly encountered a huge limestone shelf that their equipment was unable to break through.
They then brought in heavier artillery, which also broke on the limestone:
Ultimately, I had to call in the original excavator who had done the grading, since he had heavier equipment than the excavator the pool installers had hired.
He was able to break through, and then we could start the pool installation!