In 1944 a special Japanese unit, the 'Matsu Kikan' ('Matsu' meaning Pine Tree) was tasked with gathering intelligence on bases and allied air activity in Northern Australia. Sailing from Timor in a disguised fishing vessel the 'Hiyoshi Maru', the team, all experienced in unconventional warfare, successfully made landfall in Western Australia and conducted a reconnaissance in the remote Kimberley region before returning to Koepang.

The 'Koolama' was a ship of Western Australian State Shipping Service. It was built in 1936 by Harland and Wolff, ominously the same firm that built 'Titanic', for the servicing of the remote ports of the North West and Northern Territory. In 1942, bound for Darwin with a cargo of 180 passengers and war material it was attacked by Japanese bombers 35km off the Western Australian coast. Severely damaged, 'Koolama' limped into a remote bay in the Kimberley. What followed was a murky tale of bravery, malice and possible mutiny. This episode of Backyard Battlefields tells the story of 'Koolama', from it's halcyon days as the pride of the WA state ships to it's final resting place at the bottom of Wyndham harbour.

The 'Z Special Unit' was one of the most audacious and little known clandestine forces of WW2. It comprised Australian, British, New Zealand, Dutch, Timorese and other Allied personel. One of their most famous missions was 'Operation Jaywick'. This saw a disguised fishing vessel the 'MV Krait' sail from Exmouth Gulf to Singapore where the operatives, after paddling more than 50km, attacked Japanese ships at anchor before making their escape back to Australia. This extraordinary operation was followed by 81 other covert missions including the ill-fated Operation Rimau and Operation Semut. I had the privilege of speaking with Gavin Mortimer author of the Osprey Publication 'Z Special Unit' about the history and events surrounding this incredible force. Gavin is also the author of some other seminal books on the history of Special Forces including David Stirling: The Phony Major, The SBS in World War II and Merril's Marauders.