"A World War II Sexton self-propelled gun was used to demolish a building at a Victorian fort near Portsmouth.
The blast began the redevelopment of Fort Nelson, on Portsdown Hill above the city, home to one of the world's finest collections of artillery.
A 1930s bungalow at the front of the museum was ceremonially "blown up" to mark the start of the £3.5m project.
The work will include recreating a "hospital for soldiers", similar to one that existed at the fort in the past."
Watch video here:
BBC NEWS | UK | England | Hampshire | WWII gun 'blows up' fort bungalow