Showing posts with label Jacques-Yves Cousteau. Show all posts
Showing posts with label Jacques-Yves Cousteau. Show all posts

Tuesday, October 23, 2012

Red Sea- Egypt~ "SS Thistlegorm Wreck Dive"



Joe from Scotland, Han and Gerrard from Holland, Stevie and Patrick from Belgium, along with Steffen Seikat (Germany) from Scubadreamer, Sharm El Sheikh.

We are diving the SS Thistlegorm, Red Sea - Egypt.

Totally awesome dive!

The SS Thistlegorm was a British armed Merchant Navy ship built in 1940 by Joseph Thompson & Son in Sunderland, England.

She was sunk on 6 October 1941 near Ras Muhammad in the Red Sea and is now a well known diving site.

The SS Thistlegorm was a British armed Merchant Navy ship built in 1940 by Joseph Thompson & Son in Sunderland, England.

She was sunk on 6 October 1941 near Ras Muhammad in the Red Sea and is now a well known diving site.

 

Aft view Thistlegorm.jpg
Aft view of the Walkway leading to the bridge of the Thistlegorm
History
Civil Ensign of the United KingdomUnited Kingdom
Owner: Albyn Line
Builder: Joseph Thompson & Son
Launched: 9 April 1940
Sponsored by: Mrs. K.W. Black
Completed: January 1941
Homeport: Glasgow, Scotland
Fate: Sunk 6 October 1941
Status: Wrecked
General characteristics
Tonnage: 4898 gt
Displacement: c.13,000 tons fully loaded
Length: 128 m (419 ft)
Beam: 18 m (59 ft)
Installed power: three-cylinder, triple-expansion, steam engine, 1,850 I.H.P (1,380kW))
Propulsion: single screw
Crew: 41
Armament: 4 inch (101mm) low angle gun and a 3 inch (77mm) anti-aircraft gun (per admiralty record AFO 1524/41)

 

 

 

Construction

The SS Thistlegorm was built by Joseph Thompson & Sons shipyard in Sunderland for the Albyn Line and launched in April 1940.

She was powered by a triple-expansion steam engine rated to 365 hp (272 kW)[citation needed].

The vessel was privately owned but had been partly financed by the British government and was classified as an armed freighter.

She was armed with a 4.7-inch (120 mm) anti-aircraft gun and a heavy-calibre machine gun attached after construction to the stern of the ship.

She was one of a number of "Thistle" ships owned and operated by the Albyn Line, which was founded in 1901, based in Sunderland, and had four vessels at the outbreak of World War II.[1]

The vessel carried out three successful voyages after her launch.

The first was to the US to collect steel rails and aircraft parts, the second to Argentina for grain, and the third to the West Indies for rum.

Prior to her fourth and final voyage, she had undergone repairs in Glasgow.[2]

Last voyage

Diving the Thistlegorm
 
 
Anti-aircraft gun on the stern of the Thistlegorm
 
 
Trucks, part of the cargo of the Thistlegorm
 
 
She set sail on her fourth and final voyage from Glasgow on 2 June 1941, destined for Alexandria, Egypt.

The vessel’s cargo included: Bedford trucks, Universal Carrier armoured vehicles, Norton 16H and BSA motorcycles, Bren guns, cases of ammunition, and 0.303 rifles as well as radio equipment, Wellington boots, aircraft parts, railway wagons[3] and two LMS Stanier Class 8F steam locomotives.[4]

These steam locomotives and their associated coal and water tenders were carried as deck cargo and were for the Egyptian Railways.

The rest of the cargo was for the Allied forces in Egypt. At the time the Thistlegorm sailed from Glasgow in June, this was the Western Desert Force, which in September 1941 became part of the newly formed Eighth Army.

The crew of the ship, under Captain William Ellis, were supplemented by nine naval personnel to man the machine gun and the anti-aircraft gun.

Due to German and Italian naval and air force activity in the Mediterranean, the Thistlegorm sailed as part of a convoy via Cape Town, South Africa, where she re-fuelled, before heading north up the East coast of Africa and into the Red Sea.

On leaving Cape Town, the light cruiser HMS Carlisle joined the convoy.

Due to a collision in the Suez Canal, the convoy could not transit through the canal to reach the port of Alexandria and instead moored at Safe Anchorage F,[5] in September 1941 where she remained at anchor until her sinking on 6 October 1941.

HMS Carlisle moored in the same anchorage.

There was a large build-up of Allied troops in Egypt during September 1941 and German intelligence (Abwehr) suspected that there was a troop carrier in the area bringing in additional troops.[5]

Two Heinkel He 111 aircraft of II Staffeln, Kampfgeschwader 26, Luftwaffe,[6] were dispatched from Crete to find and destroy the troop carrier.

This search failed but one of the bombers discovered the vessels moored in Safe Anchorage F.

Targeting the largest ship, they dropped two bombs on the Thistlegorm, both of which struck hold 4 near the stern of the ship at 0130 on 6 October.[5]

The bomb and the explosion of some of the ammunition stored in hold 4 led to the sinking of the Thistlegorm with the loss of four sailors and five members of the Royal Navy gun crew.

The survivors were picked up by HMS Carlisle.

Captain Ellis was awarded the OBE for his actions following the explosion and a crewman, Angus McLeay, was awarded the George Medal and the Lloyd's War Medal for Bravery at Sea for saving another crew member.

Most of the cargo remained within the ship, the major exception being the steam locomotives from the deck cargo which were blown off to either side of the wreck.[4]

 

Discovery by Cousteau

In the early fifties, Jacques-Yves Cousteau discovered her by using information from local fishermen.

He raised several items from the wreck, including a motorcycle, the captain’s safe, and the ship’s bell.

The February 1956 edition of National Geographic clearly shows the ship’s bell in place and Cousteau's divers in the ship’s Lantern Room.

Cousteau documented diving on the wreck in part of his book The Living Sea.

Rediscovery and recreational dive site

A view of the winch sitting on the deck
 
 
Following Cousteau’s visit, the site was forgotten about except by local fishermen. In the early 1990s, Sharm el-Sheikh began to develop as a diving resort.

Recreational diving on the Thistlegorm restarted following the visit of the dive boat Poolster,[7] using information from another Israeli fishing boat captain.

The massive explosion that sank her had blown much of her midships superstructure away and makes the wreck very accessible to divers.

The depth of around 30 m (100 feet) at its deepest is ideal for diving without the need for specialist equipment and training.


The wreck attracts many divers for the amount of the cargo that can be seen and explored.

Boots and motorcycles are visible in Hold No. 1. Trucks, motorcycles, Wellington boots, rifles, Westland Lysander wings,[8] about twenty Bristol Mercury radial engine exhaust rings and a handful of cylinders[9] and Bristol Blenheim bomber tailplanes[10] are visible in Hold No. 2. Universal Carrier armoured vehicles, RAF trolley accumulators,[11] and two Pundit Lights[12] can also be found.

Off to the port side of the wreck level with the blast area can be found one of the steam locomotives which had been stored as deck cargo and the other locomotive is off the starboard side level with Hold No. 2.[4]

The wreck is rapidly disintegrating due to natural rusting.

The dive boats that rely on the wreck for their livelihood are also tearing the wreck apart by mooring the boats to weak parts of the wreck, leading to parts of the wreck collapsing.

For this reason, in December 2007 the Hurghada Environmental Protection and Conservation Association (HEPCA) a non-governmental organisation installed 32 permanent mooring buoys and drilled holes in the wreck to allow trapped air to escape.[13]

During this work, the vessel was closed off to recreational diving.

However, as of 2009, none of these moorings remain as the blocks themselves were too light (resulting in ships dragging them), and the lines connecting the moorings to the wreck were too long (meaning with the strong currents in the area, people would find it impossible to transfer from the mooring to the actual wreck).

As a result, all boats now moor off directly to the wreck again.

Common interesting animals around the wreck are tuna, barracuda, batfish, moray eel, lionfish, stonefish, crocodilefish, scorpionfish and sea turtle.

The Times named the Thistlegorm as one of the top 10 wreck diving sites in the world.[14]

Getting There

To access the wreck you must travel by boat.

Day trips operate from Sharm el Sheikh with an early start due to the distance from the port.

Alternatively liveaboards from Sharm el Sheikh and some from Hurghada provide divers with the opportunity to dive the wreck.

Source: Wikipedia.org


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Monday, October 22, 2012

Open Water Diver Skills~ "For SCUBA Diving"


Open Water Diver Skills  for SCUBA Diving.


Scuba diving is a mode of underwater diving in which a scuba diver uses a self-contained underwater breathing apparatus (scuba) to breathe underwater.[1]

Unlike other modes of diving, which rely either on breath-hold or on breathing gas pumped from the surface, scuba divers carry their own source of breathing gas, usually compressed air,[2] allowing them greater freedom of movement than with an air line or diver's umbilical and longer underwater endurance than breath-hold.

Scuba equipment may be open circuit, in which exhaled gas is expelled to the surroundings, or a closed or semi-closed circuit rebreather, in which the breathing gas is scrubbed to remove carbon dioxide, and the oxygen used is replenished from a supply of feed gas before being re-breathed.

Scuba diving may be done recreationally or professionally in a number of applications, including scientific, military and public safety roles, but most commercial diving uses surface supplied diving equipment when this is practicable.

A scuba diver primarily moves underwater by using fins attached to the feet, but external propulsion can be provided by a diver propulsion vehicle, or a sled pulled from the surface.

Other equipment includes a dive mask to improve underwater vision, a protective dive suit, equipment to control buoyancy, and equipment related to the specific circumstances and purpose of the dive.

Scuba divers are trained in the procedures and skills appropriate to their level of certification by instructors affiliated to the diver certification organisations which issue these certifications.

These include standard operating procedures for using the equipment and dealing with the general hazards of the underwater environment, and emergency procedures for self-help and assistance of a similarly equipped diver experiencing problems.

A minimum level of fitness and health is required by most training organisations, but a higher level of fitness may be appropriate for some applications.


 
Recreational scuba diver.


Origins

Original Aqualung scuba set.
1: Air Hose, 2: Mouthpiece, 3: Regulator, 4: Harness, 5: Back plate, 6: Tank
 
 
By the early twentieth century, two basic systems for scuba (self-contained underwater breathing apparatus) had emerged: open-circuit scuba where the diver's exhaled breath is vented directly into the water, and closed-circuit scuba where the carbon dioxide is removed from the diver's exhaled breath which has oxygen added and is recirculated.

Rebreathers

The closed-circuit rebreathers were first developed for escape and rescue purposes, and were modified for military use, due to their stealth advantages, as they produce very few bubbles.

The first commercially successful closed-circuit scuba was designed and built by English diving engineer, Henry Fleuss in 1878, while working for Siebe Gorman in London.[3][4]

His SCBA (self-contained breathing apparatus) consisted of a rubber mask connected to a breathing bag, with (estimated) 50-60% O2 supplied from a copper tank and CO2 scrubbed by rope yarn soaked in a solution of caustic potash; the system giving a duration of about three hours.[4][5]

Sir Robert Davis, head of Siebe Gorman, perfected the oxygen rebreather in 1910[4][6] with his invention of the Davis Submerged Escape Apparatus, the first practical rebreather to be made in quantity.[7]

Rebreathers have been increasingly used by civilians for recreation, especially since the end of the Cold War.

This reduced the perceived risk of attack by Communist Bloc forces, including by their combat divers.[clarification needed]

After that, the world's armed forces had less reason to requisition civilian rebreather patents, and automatic and semi-automatic recreational diving rebreathers started to appear.[citation needed]

Open-circuit scuba

The first commercially successful scuba sets were the Aqualung twin hose open-circuit units developed by Emile Gagnan and Jacques-Yves Cousteau in 1943, in which compressed air carried in back mounted cylinders is inhaled through a demand regulator and then exhaled into the water adjacent to the tank.[8]

The single hose two stage scuba regulators trace their origins to Australia, where Ted Eldred developed the first example of this type of regulator, known as Porpoise scuba gear.

This was developed because patents protected the Aqualung's twin hose design.[citation needed]

The single hose regulator separates the demand valve from the cylinder, giving the diver air at the ambient pressure at the mouth, rather than ambient pressure at the top of the cylinder.

Etymology

The term "SCUBA" (an acronym for "self-contained underwater breathing apparatus") originally referred to United States combat frogmen's oxygen rebreathers, developed during World War II by Christian J. Lambertsen for underwater warfare.[2][9][10]

"SCUBA" was originally an acronym, but is now generally used as a common noun or adjective, "scuba".[11]

It has become acceptable to refer to "scuba equipment" or "scuba apparatus"—examples of the linguistic RAS syndrome.

Applications of scuba diving

Shooting underwater video on scuba
 
 


Scuba diving may be performed for a number of reasons, both personal and professional.


Recreational diving is performed purely for enjoyment and has a number of distinct technical disciplines to increase interest underwater, such as cave diving, wreck diving, ice diving and deep diving.

Divers may be employed professionally to perform tasks underwater. Some of these tasks are suitable for scuba.[1][12][13]

There are divers who work, full or part-time, in the recreational diving community as instructors, assistant instructors, divemasters and dive guides.

In some jurisdictions the professional nature, with particular reference to responsibility for health and safety of the clients, of recreational diver instruction, dive leadership for reward and dive guiding is recognized and regulated by national legislation.[13][14]

Other specialist areas of scuba diving include military diving, with a long history of military frogmen in various roles.

They can perform roles including direct combat, infiltration behind enemy lines, placing mines or using a manned torpedo, bomb disposal or engineering operations.

In civilian operations, many police forces operate police diving teams to perform "search and recovery" or "search and rescue" operations and to assist with the detection of crime which may involve bodies of water.

In some cases diver rescue teams may also be part of a fire department, paramedical service or lifeguard unit, and may be classed as public service diving.[13]

Lastly, there are professional divers involved with underwater environment, such as underwater photography or underwater videography divers, who document the underwater world, or scientific diving, including marine biology, geology, hydrology, oceanography and underwater archaeology.[12][13]

The choice between scuba and surface supplied diving equipment is based on both legal and logistical constraints.

Where the diver requires mobility and a large range of movement, scuba is usually the choice if safety and legal constraints allow.

Higher risk work, particularly in commercial diving, may be restricted to surface supplied equipment by legislation and codes of practice.[15][16]

Diving activities commonly associated with scuba include:

Source:Wikipedia.org

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