9 x 1.5 metre deep cages on the bottom
7 x 1 metre deep cages on the top (plus one 2x1x0.5)
So there are 21.5 cubic meters of rock in the cages - which might be 40 tonnes of rock?
We started on the 7th and it is the 23rd today - 16 days - I worked 4 - Richard did the rest!
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