What affects the environment least – transporting rock by boat or by truck? In October this will be tested on Blasieholmen, in the very centre of Stockholm.
On Blasieholmen, a work tunnel still remains from when the Kungsträdgården underground station was constructed in the late 1970's. The tunnel is currently full of rubble, but because the tunnel will be used again when the Blue Line is extended south, this needs to be removed.