Digging Its Own Grave

Some property in London is so valuable that it has become more economical to bury excavation equipment after it’s been used to dig new basements than to retrieve it:

The challenge of adding new subterranean floors to London houses has become a highly lucrative business. The heavy lifting – or, in this case, the heavy digging – is usually contracted out to basement-conversion specialists. These firms discovered that it was reasonably easy to get a small digger (occasionally two) into the rear garden of a house on an exclusive 19th-century square. Sometimes they simply knock a hole in the wall and drive the diggers straight through the house. In other cases, the windows are so large that a digger can squeeze through without dismantling the bricks and mortar.

The difficulty is in getting the digger out again. To construct a no-expense-spared new basement, the digger has to go so deep into the London earth that it is unable to drive out again. What could be done?

A new solution emerged: simply bury the digger in its own hole. Given the exceptional profits of London property development, why bother with the expense and hassle of retrieving a used digger – worth only £5,000 or £6,000 – from the back of a house that would soon be sold for several million? The time and money expended on rescuing a digger were better spent moving on to the next big deal.

The new method, now considered standard operating practice, is to cover the digger with “hardcore”, a mixture of sand and gravel. Then a layer of concrete is simply poured over the top. Digger? What digger? The digger has literally dug its own grave – just as the boring machines that excavated the Channel Tunnel were abandoned beneath the passage they had just created.

This sounds like a circa 2006 story which is kind of nerve wracking.

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