The first tunnel under the Thames was the Thames Tunnel, designed by Marc Brunel and his son Isambard. Construction began in 1825, and it was completed in 1843, connecting Rotherhithe and Wapping. Initially opened as a pedestrian walkway and a popular tourist attraction, it was later converted for railway use and now forms part of the London Overground.
- Construction and completion: Construction on the Thames Tunnel began in 1825 and was completed in 1843.
