Basement bathroom shower drain in concrete block

[JImmyB]

I have an area in my basement that is stubbed for a bathroom. I have finally figured out what all of the pipes are for (configuration, etc...).

My problem is that the shower drain is in the middle of a concrte block which is sunk into the concrete slab; except for about 2" that sticks up above the floor surface. Somewhat semi-recessed. Can anyone PLESE shed some light on this for me?

Many thanks, ROLL TIDE!!!!
Jim

[markts30]

Might have been that plumbers way of making it easier to chip around it for moving it if required...
I am not sure - a pic would help a bit...