90% of the ground I do is exactly like yours, It is dangerous digging as TP has said, My mate held me by the ankles last week when we dug down 9ft and across, and it was a stupid thing to do, It takes nothing for sand to collapse and a whole lot more to get out, and if your down far you havent a hope if your alone - Theres times when your ferret will come out a hole a lot further away than you expected, Because rabbits seemt to dig very wide in that type of ground, Just keep your eyes open all the time and I wouldnt ferret anywhere where you cant see behind, or around, and stick to small set,