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
Lower Thames Crossing on the A128 at Chadwell St Mary in Essex. In January 2009, the Department for Transport proposed three major options to increase capacity east of London over the River Thames to be built downstream of the existing Dartford Crossing and an additional proposal to increase capacity at the Dartford Crossing. Advocates of the proposal argue that a new crossing is needed to alleviate congestion at the Dartford Crossing. Currently, there is a ferry service operating between Gravesend and Tilbury, which predominantly carries foot passengers and bicycles, Monday to Saturday. A study in a Lower Thames Crossing providing "relief to east