Growing up the movie “Attack Force Z” one of my favorite movies and still is. I have always wanted to an old school WW2 operation doing an insert by Klepper kayaks and blow-up a ship in a harbor or a bridge. You know like Cockleshell heroes or Attack Force Z  

SOE-Australia (SOA) was a WWII Special Forces and covert operations organization operating in the Pacific theater behind Japanese lines. It was made up of men and women from Australian, British, New Zealand, Canadian, South African, Indonesian, Timorese and Malay. SOA fought a secret, undercover war against the Japanese occupying force on the islands north of Australia. With the success of the British SOE unit in the European theater, Winston Churchill ordered that a similar unit be formed in the pacific. SOA was made up from many different units like the Royal Australian Navy’s  Coastwatcher’s, a propaganda unit the Far Eastern Liaison Office (FELO), the Secret Intelligence Service (SIS/SIA), a Dutch East Indies intelligence unit (NEFIS), the United States’ Philippine Regional Section (PRS, operating in the southern Philippines) and an Australian/British Special Operations group, which was to carry out missions behind enemy lines. The SOA took part in hundreds of covert operations against the Japanese and were directly responsible for eliminating thousands of enemy troops and sinking tons of ships and supplies, they paid a high price with more than eighty SOA commandos losing their lives. To maintain security, the SOA was given a cover name – Inter-Allied Services Department (IASD, mostly referred to as the ISD). It had British SOE agents that had escaped Singapore and the Dutch East Indies before it fell to the Japanese. That helped get it up and running.

SOA operators could operate in parties as small as two men, ISD Operatives faced overwhelming odds against a barbaric and increasingly desperate enemy. They conducted similar operations as many other SF groups in WWII. From Jedburgh’s type of missions (training indigenous guerrilla forces) to conduct direct action missions and raiding targets of opportunity. They also performed special reconnaissance missions close to enemy forces behind the lines.

The ISD men kept quiet about their exploits for over 50 years, and even today, the full story has never really been made public. The whole story of ISD operations during WWII is one that has been largely overlooked and misunderstood for the past 75 years. One of the main reasons for this is the misunderstanding that ISD was named Z or M Special Unit. The Z and M just referred to their administrative arm of the units. Z Special Unit was also used for requisitioning stores and transport through Australian Army channels. There are cases where Colonels were removed from transport aircraft to make room for ISD Corporals. Such was the administrative power of the Z Special Unit. So, this is how it was broken down, for Australian Army personnel and civilians assigned to ISD, and later to SRD, and as such, Z Special Unit appears on the service records of every Australian soldier who was assigned to either of those organizations. Another reason for some of the confusion is that in early 1943 the SOA was giving a new code name the Services Reconnaissance Department (SRD), and the term SOA was only to be used at the highest level. Z Special Unit does not appear on the service records of RAAF, RAN or British, NZ, Canadian, or South African personnel assigned to ISD or SRD since they weren’t enlisted in the Australian Army. However, Z Special Unit or Z Force became a common term in the post-war years, even among SRD Veterans. Although it is historically inaccurate to refer to the Special Operations as Z Special Unit. So, where do M Special units fit in? During the war an Allied Special Forces Reconnaissance Team under the command of the Services Reconnaissance Department (SRD.) It was the successor of the Coastwatcher’s unit. Raised in Queensland, Australia, in 1943, the unit operated behind enemy lines for long periods in the Pacific theatre, collecting intelligence such as enemy troop movements and shipping details. It was disbanded at the end of the war in 1945.  

Unlike its sister unit, M Special Unit wasn’t as well known for direct action missions. Z Special Unit was comprised of about 81 members and generally inserted via small boat, submarine, or airplane and conducted quick hit and run missions. They would also conduct intelligence-gathering operations. M Special Unit, on the other hand, operated behind enemy lines for extended periods and did long-range intelligence collection; as such, they tried to go undetected and, as such rarely engage the enemy.  

Also, all personal assigned to ISD were still listed as attached to the parent unit they came from. The reason for this was to help maintain secrecy. It was also used as a way to hide the funding for the ISD. As one of the best ways to keep something secret is never to show that money is going to them. The units never had an official insignia. You will often see a Z of M with a dagger through it. This was not made until 1970 and unfortunately, is mistaken for the units WWII symbol. 

One of ISD/SRD’s most famous Operations was called Jaywick. They used a 68-ton wooden ship. British authorities had seized the Kofuku Maru in Singapore following Japan’s entry into the war. In 1943 she was renamed Krait and assigned to the SRD. The objective of Operation Jaywick was for SRD members to attack Japanese shipping in Singapore. SRD commandos paddled into Singapore harbor in kayaks and attached limpet mines to Japanese enemy shipping. The stealthy raiders sank seven ships and about 39,000 tons of supplies and equipment before escaping home to Australia. By the time they returned nearly seven weeks later, the crew of 14 had carried out one of the most successful clandestine raids in Australian history. Throughout the war, the 70-foot wooden-hulled boat involved in the Jaywick raid, MV Krait, sank more shipping than any other ship in the Australian navy.  

In a subsequent mission to Jaywick called Operation Rimau, the raiding party was detected by the enemy, hunted down and executed. Seventeen of SRD members lie in graves at Kranji War Cemetery in Singapore. In Operation Copper, eight men landed on an island off New Guinea to disable enemy guns before the Allied landing. Discovered by the Japanese, three commandos were captured, tortured, and executed. Four others escaped and fled out to sea, but only one made it home.

No matter what their name was or what they are called now, the units of WWII are the forefathers of today’s Special Forces in Australian and New Zealand and helped end the war.

www.australiansas.com/Establis%20SF

As far back as 3000 B.C.E (5000 years), people were going after natural sponges off the coast of Crete and breathing through the world’s first snorkel tube that they made from hollow reeds. Aristotle, the Greek philosopher, recalled instances of divers breathing through a device similar to the trunk of an elephant.

In later years, the Assyrians developed an alternative snorkel device. They filled animal skins with air to breathe from under water. Aristotle wrote about divers who used a tube that led from the surface to the divers below. The consummate Renaissance Man, Leonardo Da Vinci, had many designs that he called diving or underwater apparatuses. He designed a self-contained dive suit and even sketched diving gloves with webbed fingers. Technically, they could be considered the first fins.

The development of the diving bell, which contained air bubbles for divers to inhale while underwater, was overseen by Alexander the Great.

• 900 B.C.E- Assyrian divers used animal skins filled with air to lengthen the time they could spend below the water’s surface.

• 333 B.C.E Alexander the Great encourages divers to develop and use the first diving bell — a large bell-shaped object that trapped air in the top of the bell (and a person) to submerge and maintain the ability to breathe.

• 1538- Greeks in Spain (Toledo) submerge themselves in a large diving bell-like gadget to the bottom of the Tagus River, only to emerge later with dry clothes and a still-burning candle.

The same concept allows modern-day snorkelers to breathe air from the surface with their face submerged. Modern rubber and plastics make equipment durable and comfortable while offering maximum safety. Snorkels have significantly improved their function and use with the advances in rubber and plastic composite materials. The most popular snorkel is the J-shaped plastic tubes connected to the diver’s mask by a flexible strap or clip assembly.

Snorkels for diving

The snorkel makes it possible to breathe safely on the surface without using the air in your tanks. When choosing a snorkel, think first about what you want to use it for and how it will most. The diameter is critical because it minimizes your effort while using it. Most snorkels are brightly colored, so dive boats can easily spot them and you, more importantly.

Free-diving Snorkels

Free-diving snorkels are often the simplest models. They are made without a complex purging system and valves to limit breathing noise; snorkels are also shorter to quickly expel water from the tube and easily tuck away. They usually have a slightly larger diameter to ventilate between two dive immersions properly. They are one of the best for Combat swimmers to use, as they are small and can be packed away quickly and come in dark colors.

Types of Snorkels

There are four common types of snorkels, and each has its advantages and disadvantages.

Classic

The classic snorkel, also called a J-style snorkel, is a plastic tube with a mouthpiece attached. This snorkel is usually slightly bent, but it can also be made to fit a more specific shape. The SCUBAPRO Apnea snorkel can be rolled up and easily stored in a pocket or attached to the sides or bottom of a Rebreather. This is the one best suited for combat swimmer operations.

Flexible Snorkel

The flexible snorkel has a purge valve. This snorkel has a flexible portion and a rigid portion, as well as a one-way valve located at the bottom that makes it easier to expel any water that may get into the snorkel. The added flexibility allows divers to fit the snorkel better around their masks and faces. The purge valve at the bottom of the mouthpiece helps ensure uninterrupted breathing as it flushes water out every time you exhale.

Simi Dry

The semi-dry snorkel is a mix of a classic and dry snorkel. The top features a splashguard, and sometimes even a flexible tube and a purge valve. The splashguard at the top helps prevent splashes or sprays of water quickly entering the tube. It doesn’t stop all the water from entering, especially if you fully submerge yourself underwater or if water covers the top like in a high wave.

Dry

The dry snorkel has a valve at the top of the snorkel. The valve blocks water and air when the snorkel is submerged—and a purge valve at the bottom. They are great for snorkeling on the surface and occasionally diving without worrying about constantly clearing water out of the tube. When used for diving, the advantage is that divers don’t have to clear them of water when they reach the surface.

As with semi-dry snorkels, the one-way purge valve at the bottom allows the user to flush water out with a few quick exhalations easily. While the dry snorkel is more convenient and efficient, it can also have its drawbacks. The valve at the top of the snorkel can sometimes become blocked. The dry snorkel may also be more buoyant underwater.

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