New German bomb found in Portsmouth Harbour during dredging work to widen the port's channel on 22 February 2017, ahead of the arrival of the Royal Navy’s new 65,000-tonne Queen Elizabeth-class aircraft carrier. The bomb weighed 500lbs (227 kg) and contained 290lbs 131 kg) of high explosives.

In this ocassion, the bomb found is of SC 250 type. This bomb type was an air-dropped general purpose high-explosive bomb built by Germany during World War II and used extensively during that period. It could be carried by almost all German bomber aircraft, and was used to notable effect by the Junkers Ju 87 Stuka. The bomb's weight was about 250 kg, from which its designation was derived.

This is the fourth WW2 unexploted bomb found from November 2015, as WW2live reported five month ago. As the Portsmouth Harbour was the most important British Royal Navy base during World War II, it was an fixe target for German Luftwaffe bombers. 

The entrance to Portsmouth Harbour was closed until around 7:30am as a precaution while Royal Navy bomb disposal experts assessed the swiftest and safest way of removing the device. Specialist divers at the scene said the bomb posed a "very serious threat". It was towed out to sea from the harbour and detonated off the Isle of Wight, as BBC reported.

Some transport services were temporarily suspended, including Gosport Ferry and WightLink services, and Gunwharf Quays was momentarily closed, as Team Locals reported.

Days before, another discoveries had been made in Portsmouth Harbour during dredging works, among them a British-made Armstrong Whitworth munition, a historic cannon, a number of anchors and other interesting glass and ceramic objects.