London Road Shelter in the Portsdown area of Portsmouth was constructed as a shelter during the second world war. The second deep shelter of its type in Portsmouth it was designed to hold 2’500 people with a contingency for another 1’500 at absolute full capacity. The tunnels are bulit into the surrounding white chalk hills. The shelter contained many amenities such as toilets, kitchens and recreational areas for chilrdren. The tunnels have been abandoned and sealed/backfilled since the end of the second world war.