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The second tier of the garden is slightly sloped so I'm planning level it out by raising it up (more digging and more/walls), hoping that I will be able to get rid of a lot of earth this way. Also some will go back inside the base walls under concrete and insulation . But that's probably very unrealistic so likely will end up as skip(s)/collection..
Dirt half pipe is a big shout tbh.
hats off to your digging, what are you going to do with all the earth you dug ou t?