The underground profession that few would face removes fatbergs from London's sewers before the city faces overflows.

The underground profession that few would face removes fatbergs from London’s sewers before the city faces overflows.

Written by Viviane Alves

Published on 20/05/2026 at 23:26

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Urban sanitation specialists work under heat, flammable gases, and petrified waste to preserve the historic galleries of the British capital.

The underground infrastructure of London hides a problem that is not very visible but highly critical. Specialized sanitation technicians face the so-called fatbergs, giant blocks formed by fat, cooking oil, and non-biodegradable waste improperly discarded into the sewage system.

These hardened masses directly threaten the city’s Victorian galleries, built in the 19th century. Trained teams need to remove the blockages before they reduce the flow of the ducts, cause overflows, and compromise public health.

Thames Water reported in 2025 that fatbergs remain among the biggest challenges of London’s sewage system. In extreme cases, these structures reach large proportions and require prolonged operations in high-risk underground areas.

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How fatbergs form inside London’s sewers

Operator in yellow protective clothing removes giant block of fat and waste in underground tunnel in London. — Worker uses a hydraulic jet to remove a hardened fatberg inside an underground sewer gallery in London.

The process begins with the improper disposal of fat, oil, and non-biodegradable materials in sinks and toilets. These wastes adhere to the walls of the pipes and, over time, form increasingly resistant solid layers.

London’s underground network still uses part of the galleries created during the Victorian era. This historical infrastructure makes constant maintenance even more important, as the old ducts may suffer more from heavy accumulations.

The lack of periodic removal allows the blockages to reduce the passage of sewage. In critical situations, fatbergs can cause overflows, contaminate urban areas, and cause permanent structural damage.

The extreme risks faced by underground workers

The professionals responsible for removal work in confined environments, with little ventilation and the presence of flammable gases. The activity requires technical preparation, appropriate equipment, and strict safety protocols.

The heat in the underground galleries increases physical wear during operations. Technicians use manual tools and high-pressure hydraulic jets to fragment the petrified layers.

Some blocks harden so much that they take on an appearance similar to concrete. Removal requires strength, precision, and constant risk control, as workers remain close to toxic waste and intense odors.

Why the operation protects the city’s historical infrastructure

The removal of fatbergs preserves the functioning of the sewage system and reduces the risk of collapse in densely populated areas. The operation also protects ancient underground structures, which remain essential to the routine of the British capital.

Educational campaigns reinforce the importance of proper disposal of fat and household waste. This guidance aims to prevent common materials from turning into solid barriers capable of affecting entire neighborhoods.

The routine of these workers reveals a little-known side of modern sanitation. Beneath the streets of London, improperly discarded fat can create giant blocks, threaten a historic city, and require a profession that few would have the courage to face.

Would you have the courage to descend into the sewers of London to face giant blocks of fat and prevent an entire city from suffering from overflows?

The underground profession that few would face removes fatbergs from London’s sewers before the city faces overflows.

Urban sanitation specialists work under heat, flammable gases, and petrified waste to preserve the historic galleries of the British capital.

How fatbergs form inside London’s sewers

The extreme risks faced by underground workers

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The underground profession that few would face removes fatbergs from London’s sewers before the city faces overflows.

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How fatbergs form inside London’s sewers

The extreme risks faced by underground workers

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