2023-06-24 07:34:49
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Pisestry submersible as it is pulled above the surface by a parent ship.
2 hours ago
Titan submarine tragedy It has ignited worldwide interest in the dangers of deep sea exploration. and the extreme difficulty of rescuing submarines or small submarines. This is especially true in cases where such vehicles are stuck at the bottom of the ocean at a depth of several kilometers.
If looking back on the past events that human beings were able to perform successful underwater rescues. The case of the submersible Pisces III, which took place 50 years ago, still holds the world record. It was a successful underwater rescue at depths of up to 480 meters, an easier task than the Titan submarine rescue. Which had an accident at a point that was almost 8 times deeper
On August 29, 1973, 28-year-old former Royal Navy submarine Roger Chapman and 35-year-old engineer Roger Mullinson dived to the bottom of the Atlantic Ocean. After an unexpected incident with Pistry. The Canadian company’s commercial submarines they work on laying underwater telephone lines. 241 kilometers off the coast of Cork, Republic of Ireland
Chapman said they worked underwater shifts for eight hours at a time. Pisiestry will begin diving to a depth of regarding 500 meters at regarding 1:15 a.m.
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Roger Chapman sleeping in the Pistry submersible.
but before that Chapman, who was responsible for the maintenance of the submarine. Ordered to replace the oxygen tank that was only half full with air. and put in a tank full of oxygen instead Even though it’s heavier and the original tank has enough air to last through 8 hours of operation.
“Luckily, I decided to replace the oxygen tank. Until there was enough air to breathe while waiting for the rescue Otherwise we wouldn’t have survived,” said Chapman.
This was because the Pisystry had an accident. While the mission was completed at 9:18 a.m., when the mother ship above was pulling the cable to bring the craft to the surface. There was a jolt so strong that the ship was flung backwards. and dives into the bottom of the sea once more in an upside-down manner
Later investigation found that The door cover of the submarine was accidentally hooked by a cable. Causing sea water to spill into part of the engine room Until the vehicle weighed up to 1 ton and the engine might not work normally.
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The Pistry crew as they are rescued from the submersible.
As the Pistry sinks at a speed of 65 kilometers per hour Chapman and Mullinson made every effort to mitigate the impact of the crash on the ocean floor. This might cause them serious injury or even death. Like a car accident on the road
Mullinson recalled that “We quickly shut down the submarine’s electrical and mechanical systems. They then dropped the 181 kg lead weight to make the craft lighter. Then we find something to make a cushion to support shock. Curl up and bite the white cloth in your mouth so that you don’t accidentally bite your tongue.”
Chapman added, “Luckily, we were not injured following falling to the ocean floor. But all the equipment in the ship was scattered and messed up. We only have flashlights to light while waiting for help in the dark.”
At that time, the Pisysy was able to communicate with the mother ship via telephone lines. There was still regarding 64 hours of oxygen left for the crew to breathe. But Chapman and Mullinson decided to climb higher in the submersible and lie still, avoiding talking or moving. to escape the accumulation of carbon dioxide and reduce the rate of oxygen consumption to the lowest possible
Mullinson said that “At the bottom of the ocean is very cold. We lie down holding each other’s hands and occasionally squeezing each other’s hands. to signal that they are still safe Only then was the sound of the dolphins approaching from time to time to accompany us.”
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Chapman and Mullinson later received help.
Immediate mobilization was called for rescue missions. The support ship responsible for the submarine Pisces II (Pisces II) was summoned from the North Sea. The Royal Navy escorted HMS Hecate with extra-long cables, along with the Canadian Coast Guard ship John Cabot. United States Navy Division Has sent the CURV III submarine capable of disposing of underwater bombs to help.
Even the next day, Aug. 30, the Pisiestry crew, stranded at the bottom of the sea will receive a message of encouragement sent from HMS Queen Elizabeth II But the rescue mission that began in earnest on August 31 did not go as expected. Due to the Pisces II and Pisces V submarines, which are equipped with cables and grappling hooks to bring back the crashed craft. has broken the cable before And when he dived once more, he mightn’t find the Pisystry.
Rescue teams were able to determine the location of the sunken ship. In the followingnoon of August 31, but following all the submarines that came to help Failed time and time once more to bring the cables into the Pisystry. It wasn’t until the early hours of September 1 that the Pisies II and CURV III missions were completed.
At 1:17 p.m. on September 1, a total of more than 84.5 hours following the two crews left for work. The Pisystry was pulled above the surface only 12 minutes before its oxygen depletion.
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There was a warm welcome to the victims back home.
Chapman said He and Mullinson were able to manage their use of emergency air supply in a crisis. By turning off the release of oxygen periodically and using lithium hydroxide to purify exhaled carbon dioxide back into oxygen a small amount as well Until being able to extend the time that there is air to breathe up to 12.5 hours from the original 72 hours when diving with a full tank of oxygen
Mullinson currently resides in the UK. He worked underwater engineering for the same company until 1978 and was honored for his work with The Shamrock Trust in 2013.
Chapman immediately resigned from his job. After surviving the Pistry crisis, He later founded Rumic, which provides submarines and maritime security. Until becoming one of the most influential people in the industry He passed away in 2020 at the age of 74.
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