Boltar wrote:
Well, at the Saturday press conference two days after the bombing Tim
O'Toole stated that the Piccadilly line tunnel was intact,

Just from what I've seen in the media and by the consequences of the
bombs it seems to me that they weren't all that powerful (otherwise
the carriages would have completely annihalated and no one inside
would have survived) so I suspect damage to the tunnels (which are
built a lot stronger than the trains) is probably limited to damaged
cabling and track.

B2003

Cabling can be a problem though. It was on the news a while ago. The
reason the Northern Line took so long to get working last time that had
an accident was that they didn't have any up to date wiring diagrams.
If the Piccadilly line is the same then that could take a while too.