A six-metre steel wreath has been unveiled at the Australian National Maritime Museum to commemorate the loss of 35 crew members from Australia's first submarine, HMAS AE1.
The 800-tonne submarine went missing without a trace whilst on patrol off the coast of Papua New Guinea on September 14, 1914.
Museum director and CEO Kevin Sumption says the new sculpture, titled "...the ocean bed their tomb" was commissioned to ensure their story is never forgotten.
"It's a very fitting way to pay tribute to these brave men who gave their lives, and the families that they left behind," Mr Sumption said.
"We hope that some day soon the mystery of AE1 will be resolved."
The floating sculpture reflects off the waters of Darling Harbour by day, and is illuminated with LED lights under the surface at night.