'Concreteberg' The Weight Of A Blue Whale Plagues London's Sewers

Let's put together some facts:
1. The mass is longer than a football field and weighs a whopping 115 tons (or almost 105 metric tons).
2. The workers will need to literally chip away at the giant block, using a number of tools including jackhammer pneumatic drills and high-pressure jets.
3. Thames Water says it's expecting a two-month process that will cause traffic disruptions in London's Islington neighborhood, around the corner from City, University of London.
4. High crime area. According to police.uk, within this group, Islington has a higher crime rate across total crimes.

Questions:
1. Can we get past the thought of this is one bag of concrete?
2. Could this be an organized thought process by people?
3. Is this just a lazy contractor dumping some concrete? But remember the total tonnage.
4. Approximately 51,000 cameras that are run by the police to help watch citizens in the capital.

2nd Source:
https://www.verisure.co.uk/advice-and-help/crime-statistics/islington-crime-rates

3rd Source:
https://www.worldatlas.com/articles/most-spied-on-cities-in-the-world.html