Major works are taking place at BlackFriars underground station. When completed in 2011 the station will be accessible from both sides of the Thames, with a walk way under the Thames.
Much of the building materials, including huge steel girders, arrive via the river on equally huge barge. The barges need to be anchored into place for unloading and this needs two anchors per barge. One anchor in the river and one on the riverbank when the tide allows. As you can see when an anchor is on the riverbank it makes an excellent seat for a quick phone call.