you can see the old liner looks like vinyl between the brick tot he block ,okay now, you've gone and made it even more curious; no concrete
Your soil at the base is not just sand it has a good deal of silt/clay in it as well from what i can see. your sand is not draining particuraly well it you fill the hole with dirt you must remove most of the mud and water. ADD YOUR SOILS IN 6 INCH LAYERS. then compact it with a hand tamp or power vibrator. This has to be done if you want the area not to sink in a year and continue for years. like was mentioned remove the brick and one course of block . fill up to that block and then you'll want to have a minimum of 4" top soil and make sure your area is pitched so that the water runs away from the area . but like was said i would turn it into a flower box. Maybe throw something that is less maintenance like carnivorous plats
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