Just days ago the Internet was inaccessible to thousands of BT customers. During the 2009 floods in Cumbria the emergency services could not communicate, even using their radios, because the cables carrying the Internet failed when the bridges collapsed. Amateur Radio operators practice state of the art wireless communication that does not rely on the Internet but can still link people and computers locally, but also right around the world. Come and find out you can join in and experiment with computers, electronics and wireless communications. There's also an installation where you can have a go at communicating yourself.

• View this video on media.ccc.de.