A World War II-era bomb whose discovery prompted one of the largest peacetime evacuations in British history has been detonated at sea, the Ministry of Defense said on Saturday.

The 500-kilogram (1,100-pound) explosive was discovered Tuesday in the backyard of a home in Plymouth, a port city on the southwestern coast of Britain. More than 10,000 residents were evacuated to ensure their safety as a military convoy transported the unexploded bomb through a densely populated residential area to a ferry slipway, from which it was taken out to sea.