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Sunday, April 12, 2026

Ghosts in the Mail: The Penang Submarines and the 1943 Madras Spy Case

Every now and then, a piece crosses my desk that makes me drop my loupe and just stare for a minute.

If you’ve been following my blog for a while, you know I’m obsessed with the paper trails left behind by the chaotic, shadowy parts of World War II. We talk a lot about how postal history is essentially holding ghosts in your hands. Today, I want to show you exactly what I mean. I have been waiting to write a blog on this postal cover I acquired couple of years back. But, I was missing the piece to introduce it properly. That dream finally came true just yesterday when by chance I happened to find a newspaper on eBay to pair it with rare postal cover from my collection, and together, they tell the story of one of the most disastrous, secretive espionage operations of the war: the 1943 Madras Spy Case.

Let’s start with the context. This original difficult to find (of specific date with this incident) Northern India Edition of The Statesman (dated October 21, 1943) has the headline is the kind of thing you expect in a spy thriller, not a daily paper: "JAP AGENTS FOILED BY VILLAGERS / ARREST AFTER LANDING FROM SUBMARINE."


Fig1: Northern India Edition of The Statesman (dated October 21, 1943)

Here is the backstory: By late 1942, the Japanese military, working with the Indian Independence League (IIL) and the early INA, hatched a plan to drop a "fifth column" of spies onto the western coast of British India. The idea was to infiltrate, sabotage, and spark a rebellion before a planned Japanese invasion.

They sent these guys over in Japanese submarines, dropping them off the Malabar Coast in little rubber dinghies in the dead of night. It was a complete disaster. They were betrayed by double agents, their cover stories were terrible, and vigilant local villagers spotted them almost instantly. The British quietly rounded them up, tried them in secret in camera courts, and hanged several of them. They put a total gag order on the whole mess to prevent panic. In fact, this October 1943 newspaper was the very first time the British let the public know it even happened, spinning it as a massive victory rather than a close call.

But the question has always been: where exactly did these doomed agents come from?

These spies didn't just appear out of nowhere; they were trained at a highly classified espionage school in Penang, Malaya, called the Indian Swaraj Institute (funded by the Japanese Iwakuro Kikan intelligence unit and manned by Indian expatriates and former British-Indian POWs). Before I reveal the postal *(star)* item let's take a short history lesson first. 

The Swaraj Institute (Penang)

The primary training ground for these agents was a secret espionage school called the Indian Swaraj Institute (Swaraj meaning "self-rule"). The Japanese requisitioned the premises of the historic Penang Free School to serve as the headquarters for this operation.

The school was funded and overseen by Japanese military intelligence, specifically under the command of Colonel Hideo Iwakuro (head of the Iwakuro Kikan intelligence unit) and supervised locally by Captain Noboru Kaneko.

Many of the Japanese instructors were graduates of the elite Imperial Japanese Army Nakano School, which specialized in covert operations, counterintelligence, and guerrilla warfare. They brought advanced, systematic spy-craft to the Swaraj Institute. If you want to read more about it then I recommend below book.



Fig2: The Shadow Warriors of Nakano, A history of the imperial Japanese Army's elite intelligence school by Stephen C. Mercado


While the Japanese provided the facility and intelligence framework, the manpower and ideological drive came from Indians.

  • Trainees were a mix of Indian expatriate civilians living in Malaya and former British-Indian soldiers who had been captured as Prisoners of War (POWs) and convinced by INA founders like Mohan Singh to switch sides and fight for Indian independence.

  • Select Indians who showed exceptional aptitude were made instructors. For example, Kumaran Nair, who had previous paramilitary experience with the British Malabar Special Police before moving to Malaya, served as both a trainee and a key tactical instructor.

The training was intense but highly accelerated. The curriculum blended standard military combat with specialized espionage techniques. Trainees studied the socioeconomic grievances of Indian factory workers and railway employees. Their goal wasn't just to gather intelligence, but to infiltrate industrial hubs, foment strikes, and sabotage British supply chains during the "Quit India" movement.


Indian Swaraj Institute Scarce Postal Cover

That brings me to the earlier addition to the collection, and honestly, the star of this exhibit.

Surviving mail from this covert facility is practically non-existent. When I finally acquired this cover, the whole story just snapped into place.



Fig3: Letter sent with Indian Swaraj Institute marking from 1942 


Let’s geek out over the philatelic anatomy of this thing, because it is a beauty:

The "Holy Grail" Cachet Look at the bottom left. That bilingual institutional handstamp is from the spy school itself.

  • English: INDIA SWARAJ INSTITUTE. / PENANG.

  • Japanese: 印度靑年錬成所 (Translating to "Indian Youth Training Institute"). If you look closely right above "SWARAJ," there’s a quick manuscript squiggle. That’s almost certainly an initial or clearance from an institute officer giving this letter the green light to leave the compound.

The Captured Postage When the Japanese invaded Malaya, they grabbed whatever British colonial stamp stocks were lying around. Here, we’ve got a State of Perak 8-cent carmine stamp (with the Sultan of Perak’s portrait) slapped with a heavy black overprint: DAI NIPPON / 2602 / MALAYA. "Dai Nippon" is Great Japan, and 2602 is the imperial year for 1942. It perfectly dates this cover to the crucial early window when the spy school was actually active.

The Censor's Chop You don't send mail out of a covert military base without someone reading it first. On the right, we have the classic boxed Japanese occupation censor chop. The top reads ペナン局 ("Penang Bureau"). "10" is the specific censor desk, and that little black square inside the box is the personal hanko (name seal) of the guy who actually read Joga Singh Aujla’s mail.



Fig4: Back side of the Indian Swaraj Institute marking letter from 1942

The Sender & Destination Flipping it over (Fig4), the sender is listed as Joga Singh Aujla / I. S. I. Penang (I.S.I. stands for Indian Swaraj Institute). Aujla (A common Sikh/Punjabi surname) was likely a cadet—maybe even one of the guys who eventually ended up on a submarine—or an instructor. Remember Sikhs made up a significant portion of the ex-British Indian Army POWs who transitioned into the Indian National Army and the IIL in Malaya so it may be possible that sender was also an ex-POW cum IIL/INA supporter.

He was sending this down the peninsula to a Dr. N.K. Sharma at the General Hospital in Muar, Johore. Indian doctors often stayed at their posts during the occupation, and many were quietly absorbed into the medical wings of the IIL. As an exhibitor, this is what we live for. When you put that yellowed Statesman clipping next to this heavily censored, overprinted Swaraj Institute envelope, you aren't just looking at stamps and ink anymore. You’re looking at the entire lifecycle of a doomed WWII spy ring—from a cadet writing a letter in a secret Penang training camp to the tragic, heavily censored conclusion on the beaches of India.

This is why I collect.

Let me know in the comments if you guys have ever run across Swaraj Institute covers out in the wild, because I'm definitely hunting for more! Any other such Indian associations marking covers from WW2 period is also welcome!

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