A hole in the ground it maybe, but it is a pretty important one and an expensive one as well. (£42 billion). OK not all of that price is just this hole, that is the cost of all of Crossrail. This patch is Farringdon. This was where the tunnelling from Crossrail and Thameslink tunnels met. They weren't too bad in their calculations only a 100 ft out, so this station will have the longest platform as a result, 350 ft instead of the usual 250ft.
The entire project is projected to finish in 2019, linking east and west London making commuter times faster for thousands of Londoners. It promises the time travelling to Heathrow for most journeys will half.