Fixing a swimming pool crack - GIF

Fixing a swimming pool crack.

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Previously:

Cleaning a dirty swimming pool - GIF
Plastering a swimming pool - GIF
Repainting a swimming pool for summer - GIF
Sky Pool transparent swimming pool - GIF
Swimming pool water refraction - GIF
Vacuuming algae from a swimming pool - GIF

Am I crazy, or is he not standing in the pools water while using that corded electric sander?
I can see his bare feet in the water, so yup, he's the one who is nuts.

It's people like this guy why warning directions are required on everything