The ballast in Ariel is mostly iron bars and bits of lead some chain and even bags of sand.
To get a full picture of what lies beneath the whole lot needs to come out. It was a dirty filthy job. I took them out section by section and weighed each. There was 55 items with a total weight of 743.3 Kg. When all the ballast was out, I cleaned out the gunge and washed the bilge. I filled with water and let it sit for a day or so to see where if any the leaks were. There was a couple of minor weeps where some of the through-hole bolts were for the keel band. I marked these and will check them out later.
The attached is an xls of each section