Personally, I found that unconvincing as well.......
For the noise level part, will Japanese and German bid are too optimized to low speed noise level, while the French SSN has more high speed noise level reduction in their design?
Nocookies | The Australian
"Tokyo talks fail to soothe Japanese over submarine contract loss
Japanese officials have con*fronted Australia over the rejection of Japan’s submarine bid, accusing Canberra of using the wrong methods and assumptions to *declare France the winner.
In a closed-door meeting in Tokyo, Japanese Defence officials challenged the head of the Future Submarine Program, Rear Admiral Greg Sammut, after he told them Japan’s proposed Australian submarine was rejected for “technical” reasons. The Japanese in the room were told that the stealth qualities of their proposed submarine for Australia, an evolved version of the Japanese Navy’s current Soryu submarine, did not meet Aus*tralian requirements.
They were told that under modelling conducted by the Australian team, the submarine’s noise level and other stealth indicators were very good but not good enough to win the three-way competition for the $150 billion contract.
Insiders familiar with the series of meetings, held on May 12-13, say Japanese officials in the Ministry of Defence reacted by openly questioning the modelling and the assumptions used by the Australians in determining the noise and stealth qualities of Japan’s proposed submarine.
“The Australians had made their own set of assumptions about the data which they were given (by Japan) but they reached different conclusions from it to what Japan did,” one source said. “We kept asking (the Australian) why didn’t you ask that question or pose it in a different way?”
The Japanese were angered that they had not been asked to validate and further explain their own calculations on the highly sensitive noise envelope of the proposed submarine before their bid was rejected.
Japanese sources believed this was unfair because Japan had not been able to fully disclose the stealth capabilities of its Soryu boats at such an early stage of the competition process because — unlike French and German proposals — Soryu submarines are *already in service and such information needed to be partly *protected for operational reasons.
The Australian delegation was sent to Tokyo to explain why Japan lost the three-way competition to build 12 new submarines. The Australian revealed last month a second delegation was sent to Germany at the same time and told the Germans their bid failed because their proposed Australian submarine had an “unacceptable” level of “radiated noise”.
From debriefs given to Germany and Japan, it is clear France won the submarine contract *because its proposed boat, the Shortfin Barracuda, was the hardest to detect — a crucial factor in both peacetime intelligence gathering and in conflict.
Japan has taken the defeat poorly and it has strained relations with Australia.
In the debriefings, the Australians told the Japanese there were also concerns about Japan’s *approach to risk in relation to the submarine project. They said Japan’s inexperience in designing and constructed a submarine for another country placed it at a disadvantage to France and Germany, both experienced sub*marine exporters.
However, the debriefings concentrated on technical reasons for Japan’s loss and gave no indication that broader strategic *issues, such as closer military ties between Japan and Australia, were a factor in the final decision.
“The strategic issue was not discussed, all they wanted to talk about was the technical issues,” one source said.
Another source said the Australian debriefs were poorly *received and had not helped to heal the damage to the relationship caused by Japan’s loss, a *defeat which has caused significant embarrassment in Japan.
“Our people were scratching their heads when they walked out of that (debriefing) room,” one source said.
Asked about the debriefing, a spokesman for Japan’s embassy in Canberra said: “Since the details of the explanation by Australia *relate to their national security, we need to refrain from disclosing them.”
France’s DCNS was declared the winner of the submarine bid and is in preliminary contract *discussions with Defence about a project that will see the French-designed Shortfin Barracuda *replace the Collins-class fleet from the early 2030s.
The German government has commissioned a study into the reasons its bid failed. German representatives have approached neutral observers of the Competitive Evaluation Process in Australia for confidential feedback about what Germany did wrong.
The submarines, Australia’s largest defence project, is worth an estimated $50bn in the construction phase and a further $100bn over the vessels ’ lifetime. "