He said this is actually because it is a muddy river, owing to the silt on the riverbed.
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The Thames is considered to be the cleanest river in the world that flows through a major city. The Thames is home to 125 species of fish and more than 400 invertebrates. This is in spite of the fact that raw sewage is routinely pumped into the river during heavy rains.
Almost all of the UK's waterways are now considered too polluted to swim in. A 2022 House of Commons Committee report on the state of UK rivers concluded that no river in England was free from chemical contamination. Only 14 per cent of English rivers, it added, had a 'good' ecological status.
NO river water is considered safe to drink, ESPECIALLY large rivers that pass through cities. The Rio Plata (means 'silver river'), the 'Blue Danube', the Seine, Thames, Mississippi, Ganges, Yellow River, - all are a nice brownish colour partly due to the waste and surface drainage they still contain.
The Greenwich Foot Tunnel is an underground walkway that allows you to walk from Greenwich to the Isle of Dogs in London. The reason why this tunnel is so special is that it allows you to walk under the River Thames which is the main river that snakes through the city.