How could U run 12/2 and 10/3 thru a slab and up into concrete block wall, (slab may get wet); would you have to use THHN wire in conduit?

Update: The slab would be 6" thick and the concrete blocks would sit atop the slab, so before the pour one could install conduit and wire and junction boxes to vertically direct wires up into the concrete wall at strategic locations.
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