Although it is quite illegal, shoot the contractor is an option to your dilemma.
To be serious, call them up and nicely tell them that they "forgot" to install the mandatory main drain cover/grate. If they were paid in full and if they refuse to come over and install said cover, what next?
This is what I did when I removed my main drain grate which is 8 feet deep.
There are only two screws holding my grate on while there are about 10 around the perimeter that fastens the grate receiver to the main drain proper.
I have to make some assumptions and the most critical one for me would be, are the screw holes open and are the female threads intact in the main drain body?
If yes all you need is a snorkel and mask, I also use fins which makes getting to the bottom easier for me but that is your option.
What I did was unscrew the drain grate with a fillips screw driver that was taped to a long pole. I then swam down, retrieved the screws and then the grate. I did my inspection and again swam down with the grate only and a rubber mallet as I knew I would nor be able to get said grate centered properly to match the screw holes.
Once you get the holes lined up. tape the screws onto the screw driver and while hovering over the main drain install the screws with the pole/screwdriver/screw setup.
Do NOT over tighten under any circumstances.
You should probably check to see if the screw holes are open and clear of any obstructions by trying to use the pole and screw driver to insert a screw in each hole before going through the "swim down with the grate" part of the task.
You probably have an anti vortex cover which also requires 2 screws, depending on the drain manufacturer while I still use the tried and true Hayward grate.
GL and please post what you wound up doing.
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