The AP says British Telecom is ready to sell the tunnels they own that run under London:

The Kingsway Tunnels, originally built in 1942 to protect Londoners from German air raids, are being put for sale by their current owner, telecommunications company BT Group PLC.

[…]

BT spokeswoman Gemma Thomas said Saturday that the company no longer needed the tunnel because the Internet was cutting down on the need for telephone exchanges. She said restrictions on the tunnels’ use meant they could not be converted into a cool new concept hotel, an underground office or a subterranean home. BT suggested they might be suitable for government use or for a major corporation.

A museum comes to mind. Wonder who wrote/lobbied for restrictions on use.