In September 1940, the Royal Docks were subjected to a concentrated strategic aerial bombing campaign, one of the first of its kind ever witnessed.
Thousands of tonnes of Luftwaffe bombs were dropped on the docks and some of them did not detonate on impact with the water. Furthermore, no effort would have been made to recover these UXBs at the time. Consequently, this won’t be the last time German UXO is encountered in the area.
Recent 500kg German bomb finds in the U.K
The last time a German 500kg bomb was found underwater was during Portsmouth harbour dredging works in September 2017. Another WWII unexploded bomb of the same weight was encountered in 2016, buried just 1 metre beneath a disused playground at a junior school in Bath.