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These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

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Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#4
The wreck of the Edmund Fitzgerald is located at a depth of 530 feet (162 meters) below the surface of Lake Superior. That's an extremely risky technical deep dive. There were probably more people in space than non-saturation diving at this depth.

Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#5

The wreck of the Edmund Fitzgerald is located at a depth of 530 feet (162 meters) below the surface of Lake Superior. That's an extremely risky technical deep dive. There were probably more people in space than non-saturation diving at this depth.

Presumably also open circuit not rebreather given this was mid 90s. It's a pity the article doesn't detail their dive plan, the gas quantities must have been staggering.

Nowadays this type of diving would be done using an eCCR (and backup open circuit), where some software on a microcontroller controls the amount of oxygen in a breathing loop. A scrubber (hopefully) removes the CO2. Changing the gas mixture as you go is required to reach these sorts of depths because oxygen becomes toxic at pressure, and gas density itself can cause issues with breathing.

Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#6

The wreck of the Edmund Fitzgerald is located at a depth of 530 feet (162 meters) below the surface of Lake Superior. That's an extremely risky technical deep dive. There were probably more people in space than non-saturation diving at this depth.

Good lord, ascent must've taken hours at that depth. I felt daring going down 40 meters in Belize, 164 in pitch black ice cold water, trimix and hours of deco gass on the way up? No thanks.

Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#7
The ship was the pride of the American side Coming back from some mill in Wisconsin As the big freighters go, it was bigger than most With a crew and good captain well seasoned Concluding some terms with a couple of steel firms When they left fully loaded for Cleveland And later that night when the ship's bell rang Could it be the north wind they'd been feeling?

The wind in the wires made a tattle-tale sound And a wave broke over the railing And every man knew, as the captain did too 'Twas the witch of November come stealing The dawn came late, and the breakfast had to wait When the gales of November came slashin' When afternoon came, it was freezin' rain In the face of a hurricane west wind

When suppertime came, the old cook came on deck sayin' "Fellas, it's too rough to feed ya" At seven p.m., a main hatchway caved in, he said "Fellas, it's been good to know ya" The captain wired in he had water comin' in And the good ship and crew was in peril And later that night when his lights went outta sight Came the wreck of the Edmund Fitzgerald

-- Gordon Lightfoot, The Wreck of the Edmund Fitzgerald

Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#8

The wreck of the Edmund Fitzgerald is located at a depth of 530 feet (162 meters) below the surface of Lake Superior. That's an extremely risky technical deep dive. There were probably more people in space than non-saturation diving at this depth.

Good lord, ascent must've taken hours at that depth. I felt daring going down 40 meters in Belize, 164 in pitch black ice cold water, trimix and hours of deco gass on the way up? No thanks.

According to TFA they had 15 minutes at the wreck, 4.5 hours of ascent. At about 34 degrees water temp.

Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#9
I lived on an Island in Lake Huron for about 5 years and went visiting the Lake Superior area many times. To call it a lake does not really do it justice: it's an inland sea, and a most impressive one. I've seen the lake from the shore in more than one storm and it didn't look any different than the ocean, except that it seemed in many ways more violent. I asked the locals about it and they said that the lake is more violent than the sea in places but there wasn't any coherent explanation, it could be the steep rise of what eventually becomes the shoreline rather than the much more gradual one the ocean usually has.

There are also much lower periodicity waves in such constrained bodies called 'seiches':

https://en.wikipedia.org/wiki/Seiche

There is a museum dedicated to the wrecks, well worth visiting, but do bring earplugs.

https://en.wikipedia.org/wiki/Great_Lakes_Shipwreck_Museum

Re: These Men dove to the Edmund Fitzgerald shipwreck decades ago. Their stories

#10
post #9

I lived on an Island in Lake Huron for about 5 years and went visiting the Lake Superior area many times. To call it a lake does not really do it justice: it's an inland sea, and a most impressive one. I've seen the lake from the shore in more than one storm and it didn't look any different than the ocean, except that it seemed in many ways more violent. I asked the locals about it and they said that the lake is more…

Thanks for that, super interesting about sieches. A standing wave not directly from the moon or waves.From the wiki:

Lake seiches can occur very quickly: on July 13, 1995, a large seiche on Lake Superior caused the water level to fall and then rise again by one metre (three feet) within fifteen minutes, leaving some boats hanging from the docks on their mooring lines when the water retreated

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