Tunnels underneath the River Thames constructed up to 1999 for the Millennium Dome; and a tunnel to the site of the old Ferranti power station on the east side of the mouth of Deptford Creek. There is also a tunnel between Cottons centre and the old Billingsgate Fish Market near to London Bridge. Citibank used it for cabling at one point; it was large enough for a person to walk through. The Silvertown Tunnel is a new Thames river crossing proposed to supplement the existing Blackwall Tunnel, which will join the Greenwich Peninsula with West Silvertown. There is also a further tunnel about two miles
HMS Queen Elizabeth (R08) "Gleaner" and 42 Regiment, Royal Engineers to gather information on the tides, the depth of the river bed, and the height of the three river crossings (Forth Bridge, Forth Road Bridge, and Queensferry Crossing). This was necessary as the most recent data available were 60 years old. "Queen Elizabeth" sailed on 26 June 2017 to undergo sea trials. The first stage of the operation was to move the ship from inside the fitting out basin, via one of the access gates, into the Firth of Forth itself, before taking her under the three Forth bridge crossings. Once this was accomplished,