Experts unsure if human error or mechanical failure caused AE1 to sink off Papua New Guinea during first world war
Investigators believe they have solved the 104-year-old mystery of what sank Australia’s first submarine and sent 35 sailors to a watery grave off Papua New Guinea.
Experts who analysed the wreck believe HMAS AE1 sank after a ventilation valve in the hull was left partially open when the sub dived.
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