All times in UTC ·
Dashed edge = started before, or continues beyond, this day
Events on Saturday 25 March 1843 1
1843Thames Tunnel opensFirst tunnel known to be built under a navigable riverThe Thames Tunnel between Rotherhithe and Wapping opened to pedestrians after nearly two decades of construction led by Marc Isambard Brunel and his son Isambard Kingdom Brunel. It was the first tunnel known to have been built under a navigable river.