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Most importantly if the water table of the surrounding soil is high enough, it will lift an empty pool, even concrete. At most you would lower the water level below the lights. You’re likely getting wet either way.

In this case great minds (you and I) think alike.

Easy, it’s cheaper to pay the electrician to use his SCUBA gear than it is to drain and fill a pool with water.

so pre-conditions for the job must be - know swimming and have a SCUBA gear?

Not necessarily, a non-SCUBA trained electrician may choose to bid the job with the condition that the customer drains the pool before the electrician starts their work.

I have some electricians that work for me with rope access training and certifications, sometimes we bid a job using rope access instead of a hydraulic lift if it’s cheaper to do it that way. It all depends on the project and your competition.

interesting idea. I will try that one next time