Officers from the Underwater and Confined Space Search Team are attempting to remove the body of an adult from an ornamental well in a garden in Surrey.
Police said the process is likely to take some time as the positioning of the body in the four-foot deep well presents a number of logistical challenges".
Seven men were arrested on suspicion of murder this afternoon and are still being questioned by police.
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An officer who was stabbed in the eye as tried to stop the London Bridge attackers with his baton has spoken publicly for the first time.
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Six-month-old Leena Belkadi and her sister Malak Belkadi, aged eight, both died from inhalation of fire fumes, an inquest has heard.