Visitors will get the chance to delve into the bowels of a secret underground bunker when it opens to the public this weekend.

The maze of underground rooms and corridors at Brede water treatment works were built in 1991 at the tail end of the Cold War.

It was used as a civil defence nerve centre to help protect the area's water supplies in case of a nuclear war.

The bunker's thick steel doors will be open for tours on Saturday for the Southern Water and Brede Engine Society open day at the water works.

Two triple expansion steam engines have been restored by members of the society, which when operational used steam power to pump water from deep wells into reservoirs to serve Fairlight and Baldslow, near Hastings.

There will also be a chance to see the 1904 and 1940 engines, housed in the Grade II listed buildings built by the Hastings Corporation Water Department.

The event will see other steam attractions, a collection of classic cars, a Punch and Judy show, a miniature railway, a barbecue and a bouncy castle.

John Foxley, chairman of Brede Steam Engine Society, said: "Last year we attracted a crowd of more than 3,000 people and we are hoping for a huge crowd again this year."

The open day runs from 10am to 4pm. Admission is free.