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the design is pretty much flawed due to the lack of cross ventilation
Assume you’d need some slope in the surface below to let the water run off too, or maybe some gravel and sand to soak it away. Either way the supports are going to be damp most of the time so better hope the pressure treating didn’t happen on a Friday.
Howard
From what I could tell when I was looking into building a sunken deck, the design is pretty much flawed due to the lack of cross ventilation. Even 'ground level' decks tend to be actually build from the ground level up, so 150mm or so finished level and I think it's generally accepted that they have a shorter lifespan. I can see yours* is probably raised on one side but closed off on most of the perimeter, so effectively no ventilation.
I was concocting a plan for a sunken deck with ventilation piped in from a cowled tube or two, but it seemed quite complex so we filled in the hole and sold the house.
*Edit: not yours