In my in-laws neck of the woods. Might be something dropped if the pier was ever used for loading or the currents have deposited it there after many years.
http://www.news.com.au/story/0,23599...-29277,00.html
NAVY divers will today inspect an unexploded bomb found under a pier at a popular holiday spot near Melbourne.
Recreational divers found the bomb under Portsea Pier on the Mornington Peninsula, south of Melbourne, yesterday.
Police have cordoned the pier off until the bomb, thought to be unexploded military ordnance, can be removed.
A defence department spokesman said two navy divers were expected to arrive in Portsea by late this morning.
Police search and rescue divers were called in to examine the badly corroded device, which is bullet-shaped and about 20cm in diameter.
The bomb is sticking out about 500cm in sand at the end of the pier.
Sergeant Vic Velthuis said the explosive was believed to be of World War II vintage.
Police did not know if the explosive was live but had closed off the pier as a precaution, he said.
"I'm not an expert, but that close to the pier, I'd reckon it would probably take out quite a large proportion of the pier (if it exploded)."
The Portsea area, near the western tip of the Mornington Peninsula, has a long military history.
Point Nepean was occupied by a series of artillery emplacements from the 1870s until the end of World War II.
The batteries guarded the entrance to Port Phillip Bay.
Large sections of the Port Nepean National Park, which borders the commonwealth land, are closed to public access because of the potential presence of unexploded ordnance from military exercises.
The Portsea Pier lies about 500m east of the edge of the commonwealth-held military land on the peninsula.
Earlier report:
http://www.news.com.au/story/0,23599...-29277,00.html