Australia Under Siege: Japanese Submarine Raiders 1942 
 	by Steven L. Carruthers 
    Solus Books, 1982, 192 pages
Three Japanese midget submarines made a surprise attack in Sydney Harbor on 
the night of May 31 and June 1, 1942. Only one midget submarine fired its 
torpedoes, with one sinking the Australian depot ship Kuttabul after 
barely missing the heavy cruiser USS Chicago (CA-29). All six crewmen, 
two each on the three midget submarines, lost their lives, and 21 sailors were 
killed in the sinking of Kuttabul. Rear Admiral Muirhead-Gould, top Navy 
official in charge of harbor security, prepared an official report on the 
attack. However, Australia Under Siege points out several errors and 
shortcomings in this version of the midget submarine attack. This seminal book 
is the first one to question critically the official story by interviews with 
battle participants, examination of various naval and government documents, 
and review of the Japanese version of the attack. After publication of the book, 
it influenced several other researchers to further examine the events to try to 
piece together what most likely happened. 
Steven Carruthers, who worked as a commercial diver and before that for nine 
years as an Anti-Submarine Air Controller (ASAC) in the Royal Australian Navy, 
first became interested in the Japanese midget submarine attack when in late 
1977 he found a wreck in Sydney Harbor that was thought to be the missing third 
Japanese midget submarine but was not. When a naval veteran contacted him and told a 
story that was significantly different than the official version, he set off to 
discover what really happened. He explains the frustrations that he experienced 
during his research (p. 163): 
	Many of the facts in this book have never before been published. They 
	were gained only with great difficulty from the still cautious survivors of 
	the raid and by arduous battles with the even more cautious custodians of 
	public records.  
	It is an indication of how officially unresolved the history of the 
	Japanese midget submarine is, that several of the Australian survivors of 
	the raid were reluctant to confide historical and military facts for fear of 
	losing their pensions or worse, being prosecuted under the Official Secrets 
	Act. The attitude of these men is a product of the quite unjustified fear of 
	being considered unpatriotic . . . a feeling that was nurtured by the closed 
	and fearful attitudes of censorship instigated by the Curtin government.  
 
Chapters 1 and 2 tell with the story of the midget submarine attack starting 
with the Japanese reconnaissance flight of Susumu Ito over Sydney Harbor two 
days prior to the scheduled attack date, but the narrative gets interrupted and 
does not finish until Chapters 9 to 12. The chapters in between provide 
background for the attack, but Carruthers gets off into some topics that seem 
more of a digression than information needed to understand the Japanese attack. 
These include Australia's constitutional problem of declaring war and the issues 
caused by the influx of American soldiers and sailors into Sydney after the 
start of the Pacific War. 
The key role of Lieutenant Keiu Matsuo in the Sydney midget submarine attack 
gets highlighted in this book. He graduated from Etajima Naval Academy, was 
selected to train for midget submarines, and 
later was transferred to the staff of Fleet Admiral Isoroku Yamamoto. He went to 
Pearl Harbor as a spy prior to the attack in order to examine the naval base and 
harbor layout. After he reported his findings back in Japan, he went on 
submarine I-22, which carried one of the five midget submarines for the Pearl 
Harbor attack, in order to brief in detail the officer selected to lead the 
midget attack. About one month following the Pearl Harbor attack, Matsuo 
strongly argued to Yamamoto for continuation of the midget submarine program 
despite the loss of all five midgets at Pearl Harbor. Yamamoto somewhat 
reluctantly agreed to proceed with preparation for a second midget submarine 
attack and with structural modifications to the midget submarine such as 
construction of hatches so that the two crewmen could move to the midget while 
the mother submarine was submerged. Matsuo commanded the midget submarine attack 
at Sydney. After Matsuo's midget submarine had been rammed and had depth charges 
dropped on it when sighted near the harbor entrance, he exhibited great patience in waiting silently for several hours 
before he entered the harbor. During 
training when his midget submarine had become stuck on the sea bottom, he had 
demonstrated the same type of calmness as he waited with a fellow crewman for 
over four hours before a vessel on the surface sighted the air bubbles being released 
slowly from the stuck submarine. 
Carruthers criticizes Rear Admiral Muirhead-Gould both for his actions during 
the night of the Japanese midget submarine attack and for his official report 
that he prepared on the subject. He concludes that the report was based on 
Muirhead-Gould's own conclusions in order to shift blame away from him and onto 
others even 
though he had responsibility for the defenses at Sydney Harbor. Carruthers 
states, "His report was submitted to the Naval Board without any corroborative 
details from key naval personnel involved in the various incidents, and appeared 
to be a smokescreen to cover any embarrassing questions" (p. 133). Reginald Andrew, 
Captain of channel patrol boat HMAS Sea Mist that sank Matsuo's midget 
submarine, in a lengthy series of personal interviews provided Carruthers with 
what happened during the night of the midget submarine attack. Many details in 
his testimony conflicted with the official version of events, and Carruthers 
concludes that there was an official cover-up but the incident was not pursued 
since casualties from the attack were not heavy. 
Despite Carruthers' criticism of Muirhead-Gould's official report, he still 
uses some of its incorrect information in this book published in 1982. For 
example, he uses the inaccurate date of May 30 rather than May 29 for Susumu 
Ito's reconnaissance flight, and he uses the impossible times mentioned in the 
report to account for the movements of Captain Howard Bode of the heavy cruiser 
USS Chicago. Peter Grose's book entitled A Very Rude Awakening, published 
25 years later in 2007, corrects many of these errors in Carruthers' 1982 book 
and represents the most thorough history of the Japanese midget submarine attack 
at Sydney Harbor. Grose received generous support from Carruthers, who provided 
him access to all tapes and files accumulated during 25 years of research. In 
addition, Carruthers published in 2006 a revised and expanded version of this 
1982 book under the new title of Japanese Submarine Raiders 1942: A Maritime 
Mystery. 
  
Wreck of HMAS Kuttabul the morning 
after Japanese midget submarine attack  
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