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Mark Rober 11 Oct 2025 35 here now

Uncovering America's Underwater City

It’s wild how oblivious we can be to what’s hidden right beneath the water. Learn to embrace failure while having tons of fun with CrunchLabs, now with 2 FREE boxes at: https://crunchlabs.com/Lake

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Comments (20)

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@Jamb0s4n From YouTube ↗ 21 Mar 2026 21
4:13 MARK GOT A SEAMOTH FROM SUBNAUTICA
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@Madii124 From YouTube ↗ 21 Jan 2026 366
This guy be teaching me more than five minutes than the entire school system
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There's another sunken town like this in Alabama and it's also super clear, it's called Smith lake and you can even sometimes see the bottom from a boat.
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1: THE CITY
2: THE BOAT
3: THE PLANES
4:FAILED DIVE
SO... THATS AN UNLUCKY LAKE
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@shivam3vedi From YouTube ↗ 21 Oct 2025 187
Don't call this a failure, Mark! You might not have found the city as expected but you took us hundreds of years in the past and tons of water deep, I'd still call that a win!🤗 amazing video as always!
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@Ktap4321 From YouTube ↗ 21 Oct 2025 251
Earth Scientist here. The reason the water changes color as they get deeper in the lake is because of lake stratification. There’s actually 3 layers of lake, which have long names I don’t feel like typing out. Assuming this was filmed in the summer, the bottom of the lake should be colder than the surface. The mixing of all the layers occurs in Fall and Spring. It’s really interesting.

On another note, I was pleasantly surprised to see bathymetry (measuring of depth in water) broken down so easily for the masses to understand.
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@roboslug From YouTube ↗ 21 Oct 2025 1400
Not finding 4 corpses is a win.
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@RyanMercer From YouTube ↗ 21 Oct 2025 2500
Uh, you without a hat was... jarring haha.
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@5UBV3T From YouTube ↗ 21 Oct 2025 662
Former Submariner here and I can attest to the Captain stating that getting a little "sea pressure" on that hatch could have corrected the issue, but that definitely seemed like a "fouled hatch". Glad he aborted the dive! Mark you've joined an elite club! I'm a relatively new fan, but you should consider doing some actual submarine videos if you haven't!
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For anyone wondering this is folsom lake. A few years ago this lake's water level got so low you could see some of the structures above the water. By structures i mean you can really only make out the foundations of the buildings
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Dude! I didn't know you were looking for stuff underwater. My team does that for Washoe County and surrounding search and rescue efforts with Side Scan aka tow fish, and a remote operated vehicle. We did the deepest recovery in Lake Tahoe at around 1570ft, a couple years ago. You should get in contact with me. :)
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@Klonduke From YouTube ↗ 21 Oct 2025 1200
Love what Crunchlab's does because I'm a mail carrier and I've delivered a handful of those boxes, and a couple of times I saw the kids watching in the window, see the crunch box, and get super excited. I always get a thank you from the kids that see me deliver these boxes, awesome job getting children excited about science and engineering!
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Do Lake Lanier next. Has a town at the bottom of the lake called Oscarville. Also known as the cursed lake.
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@flyingpizza98 From YouTube ↗ 21 Oct 2025 1800
i used to live a few miles from Folsom Lake. I remember in like 2012 or 2013 we had a really bad drought and the lake level was low enough that some of the town was visible
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As my Organic Chemistry professor always said, "Six hours in the library can save you six months in the lab."
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@marcc2474 From YouTube ↗ 21 Oct 2025 7300
In the summer of 1977, the lake level was so low that I was able to ride my motorcycle through that town.
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I love how the video doesn't force a "happy" or "successful" ending. Just optimism and a learning mentality. Well done, Mark Rober! Your positivity is contagious!
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2:45 proof that turning everything on and off again is always the best way to solve a problem
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@WinsterTV From YouTube ↗ 21 Oct 2025 21000
Somewhere under 1.3 billion tons of water… is my missing AirPod.
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@MarkRober From YouTube ↗ 21 Oct 2025 3300
It’s wild how oblivious we can be to what’s hidden right beneath the water. Learn to embrace failure while having tons of fun with CrunchLabs, now with 2 FREE boxes at: crunchlabs.com/Lake