Yes, leaving a main drain without a cover is dangerous. Fix it asap !
I would not bother draining any water. diving down 8' or 4' really doesn't make much difference.
Before doing any work near the drain. TURN OFF THE PUMP!
Get yourself a mask and snorkle and dive down and see of you can find a manufacturers name and model on it. Probably won't because they are usually printed on the cover. In this case measure the diameter of the drain hole and mounting screw spacing. Check that the mounting screw holes are in good shape while you are there.
Just about any pool store should have replacement covers to fit yours.
Diving down yourself is not hard, just take your time and do it in as many up and down trips and you need. To help you stay down while attaching the new cover I find it helps to gently lower a heavy cement block with a rope to the bottom of the pool and use that to grab onto so you don't float back up.
Just a reminder, ALWAYS TURN THE PUMP OFF WHILE WORKING NEAR THE MAIN DRAIN.
Good luck
George
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