TIL that the piles for the Shard (309.7 metres/1,016 ft) go some 55m/180.5ft into the London earth.
IL it from here:
Of course, with the Shard being so very tall, its piles are likely some of the deepest vertical things piercing the London soil. But given the plethora of underground tunnels, pipes and… well… more tunnels and pipes traversing the subterranean Big Smoke, one imagines that they must have had to be very careful where exactly they stuck them.