The Blackwall Tunnel is a road tunnel located in London, England, that runs beneath the River Thames. It connects the areas of Blackwall in the east and North Greenwich in the west. Opened in 1897, the tunnel was designed to ease traffic congestion and facilitate the movement of vehicles across the river. The tunnel consists of two separate tubes, each allowing one-way traffic. It is an essential part of the A102 road and serves as a vital link for commuters and freight transport. The Blackwall Tunnel has undergone several renovations to improve safety and accommodate increasing traffic volumes.