GFI in boat dock not working

[tbergman74434]

Had an electrician install electrical in our boat dock, but none of the three square d gfi breakers are now working. I unplugged the overhead door motors. Still the breakers will not reset. Tested hot at all three breakers, and everything in the box looks clean and new, so I doubt lightning strike. Ideas? Could the incoming power line which is direct burial cable which comes in just above the water level, be the cause of tripping? On my way back from the lake, I realized that I had not reset the power. These breakers are post 2003 models, so do they have to be reset by turning off power to them?

I am just a diyer, so any suggesting will be appreciated. Called my electrician but he is, as usual, too swamped to respond...

 

[westward10]

Thanks for the update.

 

[Megawatt]

UPDATE;
Thank you all for the helpful advice. I tried resetting all the way back at the meter, with no effect on resetting the GFCI breakers. Since I was now at the end of my knowledge, I hired an electrician. He checked it out and found that otters (or something) had chewed through the electrical cable feeding the dock, so we were getting no power to the dock. Repaired the broken cable, and all is well.

Congratulations my friend and glad your problem is resolved