Inside the tunnels running under The Mailbox in Birmingham

Hidden away under The Mailbox are these intricate tunnels.

Little would you know it but this secret postal railway system is still in place under the city centre retail mall.

The spooky 400m-long tunnel was utilised by Royal Mail employees to shift deliveries between a sorting office and New Street Station.

Indeed, it is where copies of the Birmingham Post and Mail would have been distributed too.

Below are photographs of how it looks today.