Dam! I wish I was in London tomorrow, I would be heading straight to the Thames Tunnel, which is to be opened for the first time in 145 years for two days before its shut forever! This is the last chance to see the underwater tunnel built by Brunel and completed in 1843, it took 18 years to construct and spans the Thames. Originally designed as a passage for horse and carriage but never used for the purpose, with shops along the route this was once a buzzing thoroughfare. The site will eventually form part of the East London line.