Need help with damp!

Why are there air bricks in the bay if it’s a concrete floor? A later repair job after the floor rotted?
Very annoyingly, when there is a leaking pipe in the ground causing damp and rotting the floor, some numbskulls like to pour concrete over it instead of mending it.

This makes the job of digging out the leaking pipe and replacing it a hundred times more difficult and expensive.
 
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