Lake Inferior: The Underground Lake Beneath Lake Superior

Exploration Timeline

June 1679

I have lost the reference, but I read somewhere that when the French explorer Sir Duluth heard rumors of an underground lake beneath Lake Superior, he quipped in his native tongue, “Lac d’Enfer” (literally: “Lake of Hell”). This nomenclature was mistranslated by English-speakers, becoming anglicized as “Lake Inferior” — an insidious malapropism that replaced the original meaning.

Sept. 8, 1870

Copper-helmet diver William Bitter found an entrance to Lake Inferior. He was working by the breakwater wall for the city of Duluth, offshore of what is now the Lakewalk. A large storm had damaged the wall, and he was conducting an underwater survey at the end of a 20-foot lifeline.

Working the winch and the air pump, his support team on the wall heard Bitter cry out through the speaking tube, then noticed a whirlpool opening up. They winched Bitter out as loose boulders and timbers were sucked into it.

Duluth, Sept. 8th, 1870: “He insisted on being lowered into the maelstrom.”

Once at the surface, Bitter realized the floor of Lake Superior was the ceiling of a subterranean cave, and Lake Superior was now draining into it. He insisted on being lowered into the maelstrom.

They reeled him back down, and he found himself in a vast cavern. Water spilled torrentially around him; he was in the middle of a waterfall dropping through empty space. The farther he descended, the more the water became diffused into a mist. He was lowered 600 feet — to the end of his lifeline — yet still found himself dangling in open air. He signaled through the speaking tube to ascend.

He reported his find to city officials, who allowed him to keep exploring while preparations were made to cap the hole. The city was worried the hole would widen and damage the shipping industry. Bitter had 48 hours.

Sept. 9, 1870

Bitter’s lifeline was tripled from 600 feet to 1800 feet. Lowered again through the hole, he descended 1500 feet through the air. His legs grew numb from dangling with his weighted diving shoes on. Finally he reached a body of water. The vast cave contained a lake of unknown size, stretching off into the permanent night for what seemed like infinity.

Sept. 10, 1870

This was Bitter’s third and final descent before the hole was to be capped. The tripled length of his lifeline made communication increasingly difficult through the speaking tube. But he braved it anyway, and failed to return. All his team got back was nearly the full length of the lifeline, which had been severed.

There was speculation it had snagged between the sharp edges of a quartz extrusion. But no one except Bitter knew what conditions had been encountered. The last words heard through the speaking tube were faint and indecipherable; everyone heard what they wanted to. Some said Bitter had succumbed to the mental strain of the extreme conditions, and had cut the line himself with his dive knife.

The city capped the underwater entrance with wooden cribbing weighted with boulders, and forgot about it. It is still there to this day, but its exact location has been lost. This monument to the forgotten explorer William Bitter lies buried by the shifting sands of time and the sea floor.

Jan. 6, 2013
Notes of Professor Joseph Marrow, UMD: “Scientific exploration of Lake Inferior”

“Glad to have a moment to write amidst all our preparations. An intoxicating spirit of adventure has united this team ever since the cave system was discovered under the NorShor Theater. As we determined this past week with several arduous dives, the caves lead to a vast underground lake. This is undoubtedly Sir Duluth’s ‘Lac d’Enfer,’ and the same lake which swallowed poor William Bitter in 1870. Bitter had punched through from above; our cave system represents a side entrance. We are stunned to have verified what we all considered legends.

“An initial taxonomy of Lake Inferior includes eyeless cavefish with a pearlescent lustre, a species of white crayfish, large pale waterbugs, and some colorless worms. The complete lack of pigmentation indicates Lake Inferior must be millions of years old.

“We are diving the freezing waters again today, but this time with McPurdy’s specialized air mixes calibrated for the extreme deep. We are determined to get consistent depth readings which proved elusive yesterday. Most readings fell in the 500-foot range which was deeper than anyone expected. But the data show an odd shifting of the numbers at the sea floor, possibly a dramatic thermocline. We will find out tomorrow.

“Dive plan: From the basement of the NorShor Theater, Dr. McPurdy, Dr. Oswald, and myself will spelunk 1500 feet down through the cave system below Duluth, following the lines we installed. We will haul our scuba gear for use in the submerged tunnels at the nadir. We will each have three air tanks. Then we will suit up and follow our dive lines through the flooded crevasses, lava tubes, and the great vertical crack like a drowned cathedral. Finally we will arrive at the chamber of rose quartz opening 100 feet below the surface of Lake Inferior. Exiting the chamber, we will descend the remaining 400 feet to the bottom of this secret sea.”

Jan. 7, 2013
Excerpt from the St. Louis County Sherriff’s incident report on “The Lake Inferior Diving Disaster;” statement of surviving diver, UMD Professor Joseph Marrow

“McPurdy, Oswald, and I exited the chamber into the lake, our helmet lights blazing. The water was clear as gin. A school of spectral cavefish, some as big as salmon, flowed around us like a river. The fauna here are eyeless but they detect light through the pineal gland, and shun it.

“We descended down the wall of basaltic rock. Milky veins of silicate were visible through a translucent layer of cave slime. Along this great wall’s ledges and sheer surfaces, white worms (possibly legless salamanders) and white crayfish retreated from our light beams.

“We descended into the technical-diving zone below 180 feet deep, which we all trained for. A malfunctioning rebreather will get you CO2 instead of O2 until you come off the loop and drown with blue lips. Our buoyancy inverted and we fell faster and faster, lured deeper. Even with McPurdy’s air mix, we were narced with nitrogen narcosis, oxygen toxicity, and vertigo from staring into the great depths.

“Fixating on inner space like reverse astronauts, we got to 500 feet deep and never found the bottom. Our depth finders were useless. We experienced an increasingly strong downward current, almost a whirlpool effect. The suction tugged at our legs and it became harder to control our buoyancy. It’s possible Lake Inferior drains into yet another underground lake beneath it. It’s lakes all the way down.

“We were all suffering from the rapture of the deep when McPurdy panicked and went into convulsions. Our strenuous efforts to control him burned a lot of oxygen, and his violence threatened to damage our rebreathers. We had no choice but to let the lake take him. As he was pulled into the black current, we watched his helmet lights slowly spiral down. His inchoate screaming and ranting got fainter on the com. His lights shrank to pinpoints, then disappeared altogether. Where was the bottom? It’s inconceivable there’s no bottom.

“Oswald and I took several hours of decompression stops to ascend back to the crystal cavern. We were each on our third tanks, and air was dangerously low. We began threading through the submerged passages. Oswald got stuck squeezing through a restriction beneath millions of tons of rock. We had each traversed this tight space before, but this time he got wedged, and soon he yielded to the terrors of claustrophobia. I tried freeing him, but silt got kicked up, and visibility went to zero percent. We were both panicking now. I lost my sense of direction, even lost my up and down. I could traverse the wrong passage and never emerge. Somehow, I found the dive line we’d snaked through the tunnels like Daedalus’ thread, and pulled myself from the silt cloud. Oswald cried out, cursing me, but there was nothing I could do. One of us had to make it out.

“I swam through the great vertical crack, a high-ceilinged vault of smooth stone. I glanced back and saw a figure following me. It trailed silt in its slipstream like the tail of a comet. I assumed it was Oswald and that he had freed himself. His lights were out. I went to him.

“But it wasn’t Oswald. It was the 150-year-old corpse of William Bitter, still clutching his dive knife. My passage through the tunnels had stirred up the currents and brought the perfectly-preserved Bitter along behind me in his continued exploration of the land of the dead. His antique diving suit lacked its weight shoes and weight belt. Bitter must have cut through the rubberized canvas straps in a desperate attempt to ascend after his line had been severed. Freezing water would have rushed into his helmet; his lifeline became a deathline. Trying to save himself was an act of madness.

“Perhaps he’d been exploring the caves when it happened. Or perhaps he had died in Lake Inferior’s open water, and had washed in through passages yet undiscovered. He was free-floating through the cave system, arms outstretched in the permanent rigor mortis of the anaerobic frozen dead. I saw his face through his helmet’s tiny portholes. His skin was as white as the cavefish; in the cold, the fats of his epidermis had hardened into corpse wax. My bright lights illuminated the interior of his copper helmet, stimulating eyeless white crayfish living in his mouth to pour out and exit through the length of umbilical tube trailing behind him.

“My mind became a flooded cathedral of its own. Hyperventilating, I swam away as fast as I could, but he only followed, pulled along by my wake. I’m not sure how I got away from him, or if I really did. I carry him with me in the Lake Inferior of my skull. I am told I surfaced with only six breaths left in my tanks.

“Do not attempt to recover the bodies. Seal the entrance, collapse the caves, nuke them if you have to. Forget this ever happened. I’m going to try forgetting for the rest of my life, at the bottom of a bottle of gin, my own private Hell Lake cold as the Devil.”

[All my essays here]



about 3 years ago

This was a fascinating read, well done! I love these types of stories. I only wish it were better labeled as fiction before I started trying to research more lol

Jim Richardson (aka Lake Superior Aquaman)

about 3 years ago

Thanks for your kind words, Petllama. This story is 101% true and the labeling of it as fiction was done in error


about 3 years ago

Hey Jim, man this was an amazing story and if I didn't read the tags I seriously would've thought it was real.

But I just wanted to ask you if I could have your permission to use parts of the story for a website called SCP, its an imaginary foundation which documents weird things going on it its imaginary universe and it has a competition going on for a new SCP to be added to the website, SCP - 6000 and its based on nature. I'd love to get a Minnesotan themed SCP added to the official website and after reading this story it has really inspired me, and I just wanted to seek your permission and give you credit if need be.

Just reply to this comment or shoot me an email at [email protected] if you want to talk about it cause I'm open anytime, again it was an amazing story, make more man I love to read them.

Jim Richardson (aka Lake Superior Aquaman)

about 3 years ago

Hi Lewis5999. Thanks for your positive feedback. Sounds weird. I'll think about it.


about 3 years ago

We shared this widely on our social media channels. I see the comments above. So, satire, fiction, or true? They are asking me and I want to be sure. 

Fact or fiction, it is a fun read.

Carol Charron
A Michigan Thing, LLC


about 3 years ago

Quick question. Didn't the good professor Marrow have tenure at Miskatonic University at one point? Before he came to UMD? I could've sworn I heard about him in my undergrad years.

Jim Richardson (aka Lake Superior Aquaman)

about 3 years ago

CCharon: Whereas I assert its truth, I have no credibility, but if I have no credibility and tell you it is so, does that not make it 100% true?

MrStitches: I believe you are correct


about 3 years ago

Fantastic read!!

It is unfortunate that Professor Marrow retired so early though. I wonder what he would have thought of Dr. Francis Morgan's discover of his so-called barbican along the north shore that supposedly is Castle Danger's name sake. They were never able to get it open...could have been another entrance...but I guess we'll never know ;)

Jim Richardson (aka Lake Superior Aquaman)

about 3 years ago

Kal_Randa: Next time I’m in Arkham I’ll ask him.

Jeff Love

about 3 years ago

Thanks for the read. I hope that it is true. Would make a great adventure.
Super Batman

Jim Richardson (aka Lake Superior Aquaman)

about 3 years ago

Jeff Love: Thank you. I also hope it is true

Patricia Swartz Farwell

about 3 years ago

What a terrific read. My late husband, Bruce Farwell, was a copper-helmet diver, often diving off the Duluth/Lake Superior coast and off Isle Royale in the early 1960s searching for and exploring shipwrecks with Superior Diving & Salvage. He dove with James Marshall and Jack Coghlan, many times in the wintertime through a hole in the frozen ice of Lake Superior. He loved adventure and doing what had never been done before. He would have truly loved this story.

Jim Richardson (aka Lake Superior Aquaman)

about 3 years ago

Patricia Swartz Farwell: Your comments are very welcome -- thank you.

jo-ann knowles

about 2 years ago

What an absolutely fabulous read that was. I was truly impressed and enthralled by it. My great uncle Jack was a diver of Preston docks in the U.K. My grandad had part of his suit bk in the 70s. It's always fascinated and if I'm honest, really scared me since I was a little girl. Grandad had some mad stories about him and I always wished I'd met him ... anyway I'm digressing but thanks, I really enjoyed that. Jo, Liverpool, U.K.

Jim Richardson (aka Lake Superior Aquaman)

about 2 years ago

@Jo-Ann Knowles: Really appreciate hearing this. Thank you -- interesting learning about your great uncle and his work on Preston Docks. Wish I knew more about that too! Old-school diving is indeed fascinating and scary~ Cheers

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