What's on the other side?

The flat earth maps seem to show all the oceans and continents on one flat circular plate, surrounded by a wall of ice.

What's on the other side of that plate?

If I were to go out into my back garden right now and start digging a hole straight down, how far down could I dig, where would I end up and what would I find there? (assuming I can dig infinitely without tiring or wearing out my shovel).

We have no way of knowing. Religious proponents might argue the firmament. I have in the past argued that given the flat earth model with a UN map and a gravitational force, there must be another moon below the earth to account for tides. In my current model, I would say that the question is somewhat meaningless - you would simply end up at a different point on the plane.

you would simply end up at a different point on the plane.

If by 'plane' you mean the surface of our world, then wouldn't that suggest a sphere?

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you would simply end up at a different point on the plane.

If by 'plane' you mean the surface of our world, then wouldn't that suggest a sphere?

There are several shapes that could suggest.

The flat earth maps seem to show all the oceans and continents on one flat circular plate, surrounded by a wall of ice.

What's on the other side of that plate?

I would guess rocks.  And then space.