By hand in 3 days with 3 labourers to assist. You're right, it's very deep, I used all our scaffold planks and then some for shuttering the sides of the hole. It's slow going, once you hit water you're pulling up mud and does make a mess of the garden with a surprisingly large pile of earth.
Before I started I asked around the neighbours and a couple of irrigation installers, the consensus was that there was water at between 3 and 4 meters so I never intended to go that deep. We only first saw water at nearly 6 meters. It was one of those jobs that with hindsight I probably wouldn't do again in a hurry.
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