One of World War I's biggest mysteries has been solved after a 103-year search for Australia's first submarine, the HMAS AE1, ended off Papua New Guinea.

RELATIVES of those aboard missing sub HMAS AE1, have revealed the shock and emotion behind their 103-year wait to find the vessel.

HMAS AE1 was the first submarine of the Royal Australian Navy (RAN) and was lost at sea near what is now known as East New Britain, Papua New Guinea, on September 14, 1914, with 35 crew members on ...

The HMAS AE1 went down on September 14, 1914, off the coast of Papua New Guinea. (Supplied) The pride of the Australian Navy sank with 35 souls on board. (aap) After 13 searches, the AE1 was ...

The report, Baseline Survey of HMAS AE1, found a critical, hand-operated ventilation valve designed to supply air to the engine room was partially open when the E-class submarine dived on ...

HMAS AE1 had only been in service for seven months when it left Sydney to capture what was then German New Guinea. The AE1 was the Royal Australian Navy’s first ever wartime loss.

Carrying 35 personnel, the HMAS AE1 capsized over 100 years ago in 1914, but up until last year it remained a mystery as to where the historic vessel was, reports Xinhua news agency.

HMAS AE1 had only been in service for seven months when it left Sydney to capture what was then German New Guinea. The AE1 was the Royal Australian Navy's first ever wartime loss.

An expedition to the bottom off the ocean near Duke of York Island in Papua New Guinea’s east coast could provide the answers to what happened to Australia’s first submarine, HMAS AE1, which ...

Personnel on board Microsoft co-founder Paul Allen’s research vessel Petrel in a joint US and Australian expedition to survey the wreckage of Australia’s first submarine HMAS AE1 which was ...

An expedition returns after uncovering new clues about what happened to Australia's first submarine, HMAS AE1.

HMAS AE1, the first of two E Class submarines built for the Royal Australian Navy, vanished on September 14, 1914 near the Duke of York Islands.