The Environment Agengy inquiry did not show any pollution.
The 20ft (6m) wide, 16ft (5m) deep crater opened in the ground above part of the Chiltern tunnel near Little Missenden, Buckinghamshire, in May.
https://www.bbc.co.uk/news/uk-england-beds-bucks-herts-67030442
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.bbc.co.uk/news/uk-england-beds-bucks-herts-67030442
HS2 Chiltern tunnel sinkhole did not pollute water, says inquiry
www.bbc.co.ukThe 16ft (5m) deep hole opened above part of the Chiltern tunnel in Buckinghamshire.