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Depending on how long they have been in the water, they may not be viable now.. The females lay the eggs above the water line............ you could try laying the eggs on a piece of styrofoam ( floating in the tank ) and see if they hatch ( 10-16 days )
They lay them aboce the water line usually. If your level is high they prob fell in. Best thing to do is put a floating cup in there with them inside. They need to not be in water but stay moist from humidity
I had a snail lay eggs on my clamp light but that's about it. I didn't know and went to move it and squished them.If the eggs were submerged, I'd assume that they are dead and toss them. It only takes a very short time for Mystery Snail eggs to drown. Had a friend many decades ago, she had a group of Mysteries in a tank that laid eggs so often, they knocked each other's egg casings loose and into the water. She fed hers Romaine lettuce, and some were nearly as big as my fist. She had one snail in another container, uncovered. It crawled about two feet above the aquarium and laid the eggs on the basement wall.