The latest set of documents quote several people who were reportedly involved in the matter related to the accident as well as two British intelligence reports that revisited the crash site to establish the facts.
The website also sheds light on what may have been the freedom fighter's dying words, which reflected his devotion to the cause of India's freedom.
"For 70 years, there have been doubts in certain circles whether such a tragedy at all took place. Four separate reports each corroborating the other constitute irresistible evidence to the contrary," says a statement issued by www.bosefiles.info.
The documents say that early in the morning on 18 August 1945, a Japanese Air Force bomber took off from Tourane in Vietnam with Bose, 12-13 other passengers and crew. Also on board was Lt Gen Tsunamasa Shidei of the Japanese Army and the planned flight path was Heito-Taipei-Dairen-Tokyo.
The three-member Netaji Inquiry Committee, instituted by the government of India in 1956 and headed by Major General Shah Nawaz Khan of Bose's Indian National Army (INA), was told that since "the weather was perfect and the engines (of the aircraft) worked smoothly" the pilot decided to overfly Heito and proceed straight to Taipei, arriving there late morning or early afternoon.
Major Taro Kono, a Japanese air staff officer and one of the passengers, told the committee: "I noticed that the engine on the left side of the plane was not functioning properly. I, therefore, went inside the plane and after examining the engine inside, I found it to be working all right."
He added the accompanying engineer "also tested the engine and certified its air-worthiness".
Captain Nakamura alias Yamamoto, the ground engineer in charge of maintenance at the airport, concurred with Major Kono "that the engine of the left side was defective".
He said the pilot told him "it was a brand new engine".
He went on to say: "After slowing down the engine, he (the pilot) adjusted it for about five minutes. The engine was tested twice by Major Takizawa (the pilot). After being adjusted, I satisfied myself that the condition of the engine was all right. Major Takizawa also agreed with me that there was nothing wrong with the engine."
However, soon after the aircraft was airborne there was, according to Colonel Habib ur Rahman - Bose's ADC and a co-passenger, a loud explosion.
He described it as "a noise like a cannon shot".
Nakamura, who was watching from the ground, said: "Immediately on taking off, the plane tilted to its left side and I saw something fall down from the plane, which I later found was the propeller.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)