HMAS (Her Majesty's Australian Ship) "Ovens" is a World War II era submarine, now sitting beside the Maritime Museum in Freemantle, Perth. You can buy a ticket and get a tour which takes you right through the submarine, in our case led by "John" who had served on this very submarine himself. I found it fascinating to be in this submarine, because inside everything is still in place and you can see the complexity of the water, air, hydraulic, electronic and electrical systems up close.
Australia has no nuclear submarines. These Oberon-class submarines have a huge battery (weighing over 200 tonnes) to power their electric motors. There are then two 16-cyclinder diesel engines which can be run to recharge the batteries, as long as the submarine is on (or near to) the surface.
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| HMAS Ovens, sitting on blocks in Freemantle. |
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| The motto "Silence is Golden" on the tower of the submarine. Also the Jolly Roger flag. |
John explained that this submarine was designed to be as silent as possible, and to spend much of its time sitting on the bottom listening for ships. Hence the motto "Silence is Golden". He also told a story about the Jolly Roger pirate flag they fly, something to do with some navy person sneeringly calling them pirates long ago, leading to submarines adopting the Jolly Roger as a defiant riposte.
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| Sue going down the ladder through the forward hatch. Designed at an angle so torpedoes can be loaded through it. |
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| The front compartment, where the torpedoes are fired from. Also some would sleep here! |
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| The cooking facilities for feeding the crew of 70 or so! |
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| Tiny bunks are squeezed in wherever space is available, including the corridor. |
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| Sue beside the drivers seat, in the main command centre. |
John explained that when they are at sea the captain spends the entire voyage either in the command centre above, or his tiny adjacent cabin. This is because if there is an emergency big doors are closed to divide the submarine into five compartments, and if he was caught in the wrong one he could no longer command the ship.
The big shiny pole in the photo is one of the periscopes, which can be raised to about 15 metres above the ship to allow them to look around while submerged. There are about seven of these extending tubes, for such things as drawing in air, radio reception, or releasing the engines' exhausts.
Driving the submarine is a bit like flying an aeroplane because as well as left and right it also goes up and down. The main at the controls has another beside him whose job it is to control the pumps and compressors which shift water in and out of ballast tanks. This controls the submarine's attitude and rate of ascent or descent. The controls look very complicated!
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| Some of the controls and displays in the command centre. |
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| Anybody know what these do?? |
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| We emerged from the stern hatch onto the top deck at the end of the tour. |
John was able to tell us a lot about life in the submarine. When they did deep diving tests they had to insert special bars across the oval hatch openings to prevent them collapsing in under the enormous pressure. The whole hull creaks and groans during these tests, and gets squeezed out of shape. I'm glad I'm not a submariner.