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A sunken poured in place rubber surface is a section of the rubber flooring that has lost the support of the aggregate beneath usually due to draining issues leaving the rubber dependent on its tensile strength to stay in one piece. Once that tensile strength is tested by someone physically standing over it, the rubber is usually torn, revealing a void underneath it. This is a common occurrence in poured in place rubber flooring installed over a poorly compacted crushed stone aggregate.
Typically, contractors will cut a clean cut around the hole, fill the hole with aggregate and then rubber. We don't agree with this approach. The same forces that moved the aggregate in the first place will move them again and you will be back at square one. We prefer filing the hole with something water will not dislodge, and that's buffings. When cured, poured in place base layer granules, or buffings, will let water through but keep a large enough form that couldn't be moved by the forces of water. Once the buffings have cured a wear layer is mixed and troweled on top to match the other wear layer.
Install the rubber floor over asphalt or concrete. If you have to use stone aggregate as a base aim for 95% compaction and 1% pitch. If the area used to accumulate water you might have to install a curtain drain or other type of drainage system to channel the water correctly.
