Charlie Stross@munin @gsuberland @SwiftOnSecurity However, most of the tube tunnels are dug deep—only about 30km are cut-and-cover, which might be feasible for trenchless pipes. The rest are contained in cast iron tunnel walls dug through clay up to 58 metres below the surface. Running heat exchange pipes down there would be quite a challenge!
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.