This is a clip from YouTube about a cat that stealthily sneaks up on the man with the camera. The young moggy is like Doctor Who's Weeping Angle foes. Every time you blink, the creature gets closer... :)
Described by Boris Johnson as "voracious worms nibbling
their way under London", the 150-metre long machines will take three years to
build a network of tunnels beneath the city's streets.
Tunnelling will start from the
newly-constructed portal at Royal Oak
While tunnelling the TBMs will operate 24 hours a day and move through the
earth at a rate of about 100m per week. Each one is staffed by a 20-strong "tunnel gang" and comes with its own kitchen and toilet.
The machines are monitored from a surface control room which tracks their positions using GPS.
Hydraulic rams at the front keep the 980-tonne machines within millimetres of their designated routes.
A TBM will set you back about £10m.
Once their work is finished, the machines will be sold back to their German manufacturer Herrenknecht and refurbished for further use.
At the deepest point the machines will be travelling about 40m below ground.
When complete by 2018, the line will pass through 37 stations and run 73 miles (118km) from Maidenhead and Heathrow in the west, to Shenfield and Abbey Wood in the east.
Unlike the Tube, the line's rolling stock will be the same size as mainline trains and some 1,500 passengers can be carried in each train at peak periods.




