Divers find undetonated WWII bomb lurking in city harbour

There's a bunch of things you'd expect to be submerged in a city harbour: Garbage, the odd shopping trolley, a car wreck or three.

But perhaps not an undetonated World War II-era bomb.

That's what divers discovered lurking beneath Sydney Harbour in Australia on Wednesday afternoon, resulting in police and the military called to inspect the relic.

Speaking to the Newcastle Herald, Tony Strazzari said he went diving with his friend Paul Szerenga, where the pair regularly go looking for old bottles and glassware. Of course, this time they found something quite out of the ordinary.

"I reached in and felt something heavy and pulled it out and it was a bomb," Strazzari told the news outlet.

The pair contacted authorities, and waited with the 40 centimetre (15-inch) bomb. When police arrived, they blocked off an area of Jones Bay Wharf in the suburb of Pyrmont.

"As a precautionary measure an exclusion zone was established and military personnel attended to inspect the item," a New South Wales police spokesperson said in a statement via email.

Fortunately, the bomb was deemed to be of no risk to the public, but was seized by the Australian Defence Force.

Mashable has contacted the Australian Defence Force for comment, mainly to find out what they're going to do with the bomb.