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74 YEAR OLD MYSTERY SOLVED: RV INVESTIGATOR FINDS WWII SHIPWRECK

Researchers on CSIRO's research vessel Investigator have solved a maritime mystery 74 years in the making with the discovery of the wreck of SS Macumba, a merchant ship sunk by Japanese air attack during World War II.

The discovery was made early on Wednesday morning (0115 AEDT) during a targeted survey in the Arafura Sea off the coast of Arnhem Land.

The survey was being conducted for the NT Government while Investigator was en route from Sydney to Broome.

Macumba was a 2500 ton steel merchant ship that was sunk on August 6, 1943 when two Japanese aircraft attacked at low level and scored a direct hit on the ship's engine room.

Three of the Macumba's crew were killed in the attack, with one body never being recovered. Survivors from the attack were taken aboard an escort and the Macumba was left to sink.

While the location of the attack was known, no previous search had been able to discover the location of the wreck. Until now.

Investigator's advanced multibeam sonar systems were used to locate and map the wreck which was found in 40 metres of water, and appears to be upright and relatively intact.

Marine National Facility Voyage Manager on Investigator Hugh Barker said all on board were pleased to locate the wreck and help solve this wartime mystery.

"The search was important to everyone on board this voyage and a lot of eyes were either glued to monitors or scanning the horizon for the signs of marine life that often point to features underwater," Hugh said.

"We discovered the wreck in the middle of the night after about 10 hours of searching, which was lucky as we only had a couple more hours available for the search.

"It was also really lucky that we had an excellent team on the sonar who noticed some unusual features on the seafloor near the edge of our search area and asked for the ship to do an extra wide turn outside the search area. That's when we found it!"

Once the wreck was mapped using the ships sonar systems, a specialised drop camera was then lowered into the water to photograph the site, capturing some incredible footage of the wreck and marine life around it.

"Macumba was about the same length as Investigator and it was likely that the wreck would have formed an artificial reef, providing habitat for a range of marine life," Hugh said.

"Our drop camera even got a close-up photo of an inquisitive reef shark that seemed to be guarding the site. It was a special night for all on board and we are so pleased to find the final resting place of Macumba."

Data collected by Investigator will now help inform a detailed wreck inspection report and future management as a protected historic shipwreck.

The search for SS Macumba was a collaborative effort between the CSIRO Marine National Facility and the NT Government.

Looks well preserved, interesting bottom features too.

Coordinates??