A Cold War nuclear bunker has been rediscovered after lying almost forgotten in the grounds of a castle in North Yorkshire for well over half a century.

The subterranean monitoring post at Scarborough Castle, dating back to the mid-20th Century, would have been staffed by volunteers from the Royal Observer Corps (ROC) if a nuclear war looked like becoming a reality.

The bunker was closed and sealed in 1968 and was assumed lost until an archaeological dig by English Heritage successfully pinpointed its location in the castle's grounds.

Dramatic rain and low tides have uncovered parts of a railway bridge that was demolished after a disaster in which five men died.

The Severn Railway Bridge, which spanned the river between Sharpness and Lydney, was torn down after two barges disastrously struck the bridge in 1960.

While parts of the structure are always visible at low tide, heavy rain during exceptionally low tides have washed away sediment – allowing Sharpness Lifeboat Station volunteers to explore the bridge during a rescue training session.

Crew member Luke Grinstead said it was "just fantastic" to have the opportunity to visit the remains of the bridge, which was built in the 1870s.