Hello. I was planning to lay a base for a shed. I dug up the grass and removed about 3 inches of soil only to find these beasts. These rocks seem to be buried deep and tbh I don’t fancy even attempting to try to lift them (not that I could). Obviously the base needs to be even and that isn’t going to happen with these. Any tips for how to remove or get them broken up to a point where I can have it level with the rest of the surface? Any tips would be great. Thanks in advance.