The area on Putney embankment features artwork that reflects the River Thames, including poetry, images, and fence railing made from wooden oars that have been used on the river.

Speaking at the opening, Tideway CEO Andy Mitchell said the new space was the culmination of many years of hard work and it signalled the “start of the end” for the project.

He added that more public spaces would be opened in the coming months, before testing on the new sewer begins next year.

When the system becomes fully operational in 2025, it will divert live storm flows of untreated sewage away from the River Thames for the first time.

Earlier this month the 30m-wide shaft at Nine Elms was capped off; the shaft north wall at Abbey Mills has been completed; the final pour to the pit bottom topping slab at Greenwich Pumping Station has been completed; and at Deptford Church Street, the removal of the bracing to the vortex tube has started.