This was an incredibly challenging video to make. The challenge came with getting the Navy to agree to the interview in the first place, then successfully navigating the interview without it being shut down. In the end, everyone was super professional and it was a really fun topic to learn about! I hope you enjoy, and thank you very much for considering becoming a Patron at (www.patreon.com/smartereveryday)!

What’s not classified is the competition between CO and XO over their cribbage record. Boss!

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Reminds me of my virtual submariner days, when I played Dangerous Waters for hours on end, all without crew helping me with passive sonar or target motion analysis :)

Fascinating!

1:20 nah, I think about sandwiches

fun fact, those initial three "bird calls" signatures actually have a shape that immediately sticks out to me as a bat call. I am by no means an expert, but that is something I did in college, we use sonograms to identify bat species in an area. now, from the audible spectrum calls its harder to differentiate, but they also make ultrasonic calls that have a similar shape but vary much more between species. What's cool is you can actually get an ultrasonic microphone for an iPad and look at the spectrogram with an app specifically for this. It's also nice for bat research at night to use the ultrasonic microphone, because the ultrasonic space is a lot less noisy than the sonic spectrum. always been kinda curious why that is.

Think the range chart is WRONG. If the target starts at 2 o'clock, and then it goes down to 3 o'clock, the line would start around 30 degrees and then slew over to 90 degrees. A slash to the right just as shown on the NEXT graphic.

Metal Gear Solid soundeffects for contact? Nice.

This series is awesome. Do an aircraft carrier next!

The loudest submarine?

I have watch this video multiple time because this video is just so fun and good to watch

15:07 "so you're also doing...." Xray? infrared? Microwave? Electromagnetic? It could be any of these or something else. I personally like the last one. Maybe worth a FOIA request?

Can I download all this submarine series content and compile it into single file? so I could watch like a movie.

Great series!

Sonar is basically much harder than radar in a nutshell

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These are really interesting videos but I hope you are not putting anyone in danger by making these videos. God bless our troops!

It’s kind of pointless because every sailor probably knows these concepts no matter what country’s Navi they belong. Only civilians are kept in the dark about this. As for the technology, well that’s a different thing. Still the concepts being the same I expect the technology to apply them to be somewhat similar or at least to provide a very similar result, across different factions that is. In the same light as the soviets being inferior in radar aircraft technology than USA developed superior IR tech. In the end they achieved the same results using a different tech. Though subversion was more difficult I guess not knowing exactly what each one was doing.

Dustin I love you for making this series. Marry me.

I heard that when Tom Clancy was writing The Hunt for Red October, he got a visit from the CIA, who were very interested in how he deduced the existence of the Caterpillar Drive... If one ever existed. ;)

4:00 Why does this guy look like Cory Barlog?

Great video! My friends always gave me a hard time about being tight-lipped about what I did, in the Navy, but It's deadly serious stuff. I still don't talk about it, even though our tech was much more crude. What software were you using in your description?

Raven pro?

A ton of info in this video. Neat stuff. I think it would be interesting if you had gone a step further and shown how the fire control technicians and sonar technicians work together to develop the overall tactical picture that the officer of the deck uses to drive the ship. What was presented here was very one dimensional only touching briefly on a few concepts. Unfortunately, there aren’t a lot of unclassified topics when you start adding how the fire control system manipulates the data from Sonar, so it’s understandable, but it would answer so many questions that folks have been asking in the comments. Stuff I want to share, but just like the chief and XO here, I’m buffering. LoL. Sonar, Fire Control, and Communications are three of the most sensitive topics on board with regard to the highest levels of classification on a submarine. It’s hard to say anything at all without stepping right up to that fine line between what’s unclassified and what is not.

I dread the day i get told by ANY military personnel: "Thats a no go"......

Why am I so intrigued by the bearing rate. I'm loving this

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Those Bearing Rate graphics were grrreat!.

Awesome vid. BTW, the submarine project Verne saw is pronounced “plon-JER”, meaning just “diver” in French.

Awesome! :-D

Watching the mental gymnastics used to avoid the classified stuff is pretty amazing.

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I become happiest and saddest when Destin uploads a video. Happiest when I begin watching and saddest when the video ends.

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Read a book called Blind Mans Bluff. It’s a great book about the Cold War submarine shenanigans.

I love your vids ! You brake my brain so often :D

Sorry i have bad mind. 9:15

11:22 13:15 17:26 20:32

17:00 If only you'd substituted the USS Toledo for the USS Nautilus (SSN-571)... could have made for a thoroughly confusing example.

What an awesome series! I am getting smarter everyday. Snatch blocks rule

Thank you for the informed information! I am going to listen to Twenty Thousand Leagues Under the Sea right now.

Too bad it military. Most disgusting thing in human history.

Soooo...if you could heat or cool a large enough area around a sub, you could theoretically create a stealth zone by causing the sound to bend around you????

What spectrogram software did you use?

Not to disrespect anyone. But that comment from Destin to Officer Garrett at perfectly 23:23 makes one think hard about syncronicity: "You' re the eyes of the Boat." "Yes." *HAS* *GLASSES* As I said, no hate. I am also a man with spectacles, makes it even.

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gday Destin, loving the series! is this the last one?

Why are they using the bearing rate graph in the first place? It is kind of unintuitive, what is the advantage? Can you feed it more easily to a computer? Or is it because of time? Can you better see POIs in nosy data? Great series, got me thinking a lot and thereby smarter.

"Nice."

It's actually Nautiloptimupodes

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New Sub :D

@SmarterEveryDay love your videos i was wondering if you would be able to do one on how isp' s work and also maybe sony psn and xbox live always curios on how the manged things behind the seens

More importantly, who is currently leading in cribbage?

Nautiloptimupusses... lol

great stuff!! you're a true journalist

man submariners are a different breed. they look exactly how you would expect.

Short story, I was "re-rated" from being a Sonar-Tech on Submarines. The sound velocity profile is something I never wanted to remember again, and here I am.

I love watching Destin's beautifully inquisitive mind skirting around what he actually wants to ask, and making military leaders ask each other if they can actually answer it

Excelent movie Destin. It was very interesting to watch it. Around 14th minute it blows my minds :) Thank you.

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i realy truly think you you are ein idiot.. asking every question 5x . i bet they where so annoyed most of the time..

Nice work, Comrade Destyin.

I'll consider using Audible when they support downloads for Linux systems - we don't all have (or want) access to Windoze or Macs ...

Destin i want to thank you for the amazing explanation and the animations you made to clarify the subjects. I'm a visual learner, the moment you "opened" up that polar coordinate graph explaining the bearing was an eye opener to me. You are awesome!

Classified stuff? Just ask trump he'll share with any Saudi or Russian.

Great video

After watching this, the plot of Tom Clancy's "Red Storm Rising" makes way more sense

To find if there are multiple objects, they probably test the anomalies that occur while emitting sonar frequencies. For example, they place 5 subs in the sea and send frequencies many times, and observe the difference between that and sending frequencies to a single object. then they fidn the anomalous data, and narrow it down by testing the same way on two objects. Then they know how to recognize multiple entities

So now torpedo time and crawl in the tube

Thank you, Destin -- i TRULY ENJOYED this !

A real eye opener for people interested in space travel. I'd imagine the operation of a nuclear submarine is very similar to a space capsule, or the International Space Station. I never knew how tightly packed every critical system is. Thanks Destin. Fyi, I'm starting to second guess my dream of migrating to the Moon and Mars in 30 years time. But then again, I guess a person can adapt to just about any situation in the name of survival.

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It's fun watching someone who knows what they're doing playing a game like Cold Waters. Cold war era sub warfare.

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no body talk about sonar SIZE LIMIT !! i mean contact size limit.. like no body. does this classified ?? can sonar detect small things like 10 cm fish ?

I play too much Cold Waters, this is all very familiar. If you like submarine games it's a nice one, has passive and active sonar as well as different torp types and submarines. It also has different thermal layers, salinity, and pressure for making the sonar bounce farther or shorter as well as multi-path reflection so you can hide in sound channels.

I love your content but bristle each time you say "smart" or "smarter". Intelligence (i.e. "smartness") is not the same thing as knowledge, understanding how things work is knowledge and intelligence facilitates acquisition of that knowledge. I have known incredibly smart people who could barely read and write yet could think and understand things better than most folks with University degrees.

Why didn't German U-Boats have sonar in ww2?

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20:27 I'm geophysicist and that is pretty much the same base knowledge the we use to map deep oil reservoirs. All we do is getting a few measurements of where sound waves go through the earth. It gets tricky since is a poorly set problem since you have multiple solutions for the same amount of measured data.

This is probably as much as WWII or early cold war submariners knew about sonar. Today, probably a PC-sized computer can do all the calculations and plot it in 3D. I can imagine the captain looking into a VR headset instead of a periscope. :)

The submarine serie is great but this video in particular was by far the best. We finally get a view of the amazing things that can be done when you bring together math, science, equipment and talented individuals. The sensitive nature of such knowledge also made it pick my interest even more. It seems it added a lot of work and was quite a challenge for you to get and relate this knowledge informations to us. Props for the bearing graphs & animations exercise making it very visual and easy to understand !

Unbelievably great video

Loved the metal gear solid effects ❤️

I watched this entire series tonight and was fascinated thoroughly. I am subbing. Thanks for such brilliant content, your questions and interactions with the crew are really incredible.

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If I get the first stronger ping return it can be the only "good one"? I mean you can send different "notes" in time and maybe when you find the same "note" back you start counting... Something like that, maybe.

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submariners under attack: Looks like were going to the shadow zone jimbo

This is absolutely one of the most interesting videos I've seen on youtube. Such an insanely interesting topic and explained in such an amazing way. Thank you!

Watching this series it should be used by boats for sub quals.

11:52 ... why dude why... fk... i was just getting a hold.. and you rotated the (whole graph) submarine..

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I love the fact that the supervisor seemed to be completely drained just by listening and figuring out what can and cant be said

Does anyone know what program he used to generate the spectrogram?

Watch or read any good submarine story and they talk about thermal layers to hide from the skimmers. So did they tell you that there are only 2 types of ships? Submarines and targets. :)