Fail-Safe vs. Fail-Deadly (with Colin Furze)
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Fail-Safe vs. Fail-Deadly (with Colin Furze)

August 24, 2019

I’m with Colin Furze. That’s me. Dangling upside down with magnetic shoes that he’s made. Colin, do you want to explain how these work? Basically, we’ve got a microwave transformer, you cut it in half, take one of the coils out, and you end up with this, like a little E-shaped block, whack a car battery on it, and you’ve got a super strong electromagnet which if you then put in some shoes, you can make magnet shoes! Which are great aren’t they Tom!
They are! Surprisingly physically demanding, this. Um, but let’s talk about fail-safes. Because, well, these electromagnets can be used in a lot of things they’re used in the doors in the office I work, and those doors are fail-SAFE. Fail-safe does not mean we have a backup, fail-safe means they fail, and it is safe. You see if the power fails, if there’s an emergency, something like that, then everything’s fine, the doors unlock automatically because there’s no power, and everyone can get out. There is an opposite to fail-safe, which is fail-deadly, and you usually find that in things like nuclear submarines, who have orders to fire if everything falls to pieces. These shoes? Well they may not be fail-deadly, but they’re certainly fail-unsafe, because if the electromagnets fail, or if the battery fails or if I, accidentally, push one of these shiny red buttons here, well, then I fall to the ground, neck first, swiftly followed by the incredibly heavy magnetic shoes which, will probably kick me in the face. So with all due respect to your invention Colin, which is marvelous, can I come down now?
Yep. You’re looking as red as your t-shirt. Oh my God it takes so much out of you, this does! That’s wonderful.
There you go. Colin’s channel is on screen now, he has all sorts of wonderful things like a jet powered bicycle, and world-record attempts. Thank you very much!
It’s all right. That, was take 4, and I am not doing that again. You really appreciate gravity now don’t you? Thanks Colin. [Translating these subtitles? Add your name here!]


  • Reply Squiggleblorg May 8, 2016 at 4:50 pm

    yay two of my favorite youtubers in the same video!

  • Reply Almost Brilliant May 29, 2016 at 7:55 am

    How would that have been different on the moon?

  • Reply ackly14 June 2, 2016 at 10:11 am

    these two used to host a show togeather didn't they?

  • Reply Electra Flarefire June 8, 2016 at 3:31 am

    For doors(And I'm, sure other things), it tends to be 'Fail-safe' and 'Fail-secure'.
    So fail so the doors can be opened, or fail so the door is locked.

  • Reply NoriMori June 17, 2016 at 1:34 am

    That's it? You introduced a really interesting topic, and then just stopped. I was really excited to see "the rest of the video" — and then the video was over. What the frig, guys?

  • Reply Gnuthad June 22, 2016 at 11:18 pm

    For things like locks, it's fail-safe (locks with power) or fail-secure (unlocks with power).

  • Reply firudu June 23, 2016 at 1:24 pm

    what is the difference? in both caes the system is designed to do what you want in an emergency

  • Reply jayja45 July 30, 2016 at 11:34 am

    Though the lock industry does prefer to call it "Fail-secure".

  • Reply zJoriz August 18, 2016 at 4:46 pm

    We should introduce a Gravity Appreciation Day. Would be fair, I think

  • Reply yorktown99 August 25, 2016 at 5:47 am

    I always got the vague sense that Tom Scott and Colin Furze would make for an interesting pair. Their styles are so different: Tom, quietly and nerdy enthusiasm; Colin, taking the do-it-yourself internet up to eleven (like some sort of British Tim Allen)! But they both have a genuine appreciation for good design and want to revel in doing odd, outside-the-box things. And what happens when they finally get together? Giggles. Happy giggles is what we get.

  • Reply Raiinbox August 25, 2016 at 11:47 pm

    Yessss, both of the best youtubers ever.

  • Reply Melvin8D September 5, 2016 at 9:13 pm

    Damn colin, back at it again with the inventions.

  • Reply Sonu Chadalavada September 8, 2016 at 8:45 pm

    just watching you upside down is giving me a headache

  • Reply CodeAsm September 9, 2016 at 12:18 pm

    Will you visit him again? cause this one looks fun. Ive watched collins movies before and only now seeing this makes me wonder… did you guys went for a drink after or what?

  • Reply Al Paca September 30, 2016 at 4:25 pm

    to clarify, electric strikes doors are either fail safe (unlocked when power is disconnected) or fail secure (locked when power is disconnected)

  • Reply Toasty October 1, 2016 at 8:48 pm

    i flew a kite in a public place

  • Reply Professor Yana's Forsaken Outpost October 20, 2016 at 6:53 am

    And then there's "fail-secure", where a loss of power means a door won't unlock.

  • Reply Sloth FPV October 24, 2016 at 2:17 pm

    I know the term failsafe from rc, if you lose connection, there will be a set of instructions for the aircraft to perform. Does fa though

  • Reply David Refoua November 1, 2016 at 8:45 pm

    Can you also do "Manual Override" and "Bypass"?

  • Reply Richard Stockton January 18, 2017 at 10:05 pm

    It seems like our nuclear arsenal should be fail-safe. Like, that's probably more important than doors in an office.

  • Reply McRocket February 16, 2017 at 6:04 am

    Where does Tom Scott work? I assumed he just lived off YouTube money or something similar.

  • Reply Allan Gibson February 25, 2017 at 3:10 am

    The correct terms are fail safe and fail dangerous which can be further subdivided into Fail safe detected , fail safe undetected, fail dangerous detected and fail safe undetected.

  • Reply Tyler Joseph Schommer February 25, 2017 at 7:17 pm

    I knew I recognized the name. I think I subscribed to Colin because of his Wolverine claws.

  • Reply Canana Man March 12, 2017 at 3:09 am

    jurassic park sees not knowing the magic word is fail-deadly

  • Reply Canana Man March 12, 2017 at 3:10 am


  • Reply Jasper May 14, 2017 at 5:13 pm

    Furz means fart in german, I feel bad for this guy, for his last name is embarassing.

  • Reply Teodor Baev May 28, 2017 at 8:32 pm

    Colin Furze FTW !!!

  • Reply entoris476 May 28, 2017 at 8:58 pm

    Was I the only guy that taught that the person in the thumbnail was Boris Johnson?

  • Reply Armchair Pilot May 28, 2017 at 10:36 pm

    A known, but unlikely combo.

  • Reply ttsgeb May 29, 2017 at 10:17 pm

    I was hoping for a demonstration of fail deadly, tbh.

  • Reply Dane Cook May 30, 2017 at 11:49 am

    In the security world we don't call it "fail deadly" we call it "fail secure"

  • Reply Stoney_Eagle May 30, 2017 at 1:00 pm


  • Reply Bartosz Olszewski May 30, 2017 at 5:25 pm

    guess fail-safe for these shoes would be placing a permament magnet amd then using a coil somewhere to weaken it so if something disconnects he just stays stuck to the ceiling.

  • Reply Michael Dilger May 31, 2017 at 8:14 am

    Always tie a safety noose.

  • Reply Zahlenteufel1 May 31, 2017 at 9:41 pm

    furz is fart in german

  • Reply unclhos May 31, 2017 at 10:43 pm

    I feel like this could have been a lot longer video with more information. You should re-record it.

  • Reply Mal-2 KSC June 1, 2017 at 2:31 am

    "Fail Safe" can be a security hazard. If cutting the power means all the doors unlock, it goes without saying that anyone trying to enter the building in an unauthorized manner will consider just cutting the power, waiting to see which doors everyone exits through, and then going through one of the others.

  • Reply JD June 1, 2017 at 8:01 pm

    hehe, nice collaboration

  • Reply DrearyPlane8 June 1, 2017 at 8:43 pm

    Opens up video
    How has my phone rotated again?

  • Reply Robeight June 3, 2017 at 10:46 am

    more Colin furze colabs!

  • Reply Andros Kai June 4, 2017 at 9:02 pm

    Tom doesn't really do much any more… he just kinda promotes something or someone else and says one or two interesting things nowadays… this isn't why I subscribed to this channel

  • Reply Shy Shalom June 4, 2017 at 10:29 pm

    Dude, Colin has about 5 times more subscribers than you…

  • Reply Zipo214 June 5, 2017 at 4:01 am

    I didn't learn the differences though…

  • Reply rockets-don't-make good-toast July 5, 2017 at 6:36 am

    like a bank vault that locks shut when the power is cut off, because that's its natural resting state.

  • Reply richard mattocks July 9, 2017 at 1:51 am

    I worked in the Railway industry and we called it a right-side failure (when a fault occurs but does no harm) and wrong-side failure (when trains crash etc… well you get the idea). It's an ethos in its own right

  • Reply Mel and Dev's Channel July 10, 2017 at 7:40 pm

    He looked like Elon Musk

  • Reply Wolfboy101 July 11, 2017 at 3:20 pm

    Colin is a lot more chill in this than in his videos

  • Reply Chris Collins July 13, 2017 at 9:18 pm

    When Worlds Collide

  • Reply WHEELYBINNS July 15, 2017 at 11:16 pm

    Colin's like toms wacky cousin 😂

  • Reply Da Hai Zhu July 16, 2017 at 6:11 am

    gravity, don't take it for granted.

  • Reply krisnadi imam July 17, 2017 at 5:50 am

    awesome video tom n collins!

  • Reply Chris Roosen July 21, 2017 at 2:50 am

    Also called fail safe or fail SECURE. Ie the door remains SECURE if power fails.

  • Reply Les King July 21, 2017 at 4:57 am

    Have you heard of an inversion table? it's much like this but easier to get upside down and not as dodgy as colinfurze electromagnets

  • Reply thomas barlow July 29, 2017 at 1:43 pm

    love the vids Tom but its fail-safe and fail-secure…

  • Reply Phil O'Shaughnessy August 5, 2017 at 8:03 am

    A back-full of metal stool. Ouch1

  • Reply gareth morgan August 5, 2017 at 10:17 pm

    Two of my favourite YouTube channels, combined.

  • Reply GlassCurtain September 8, 2017 at 2:43 am

    This is very true. I used to install alarms and access control systems and you have to make sure to tie the access control into the fire alarm system to release the mag locks in the event of an alarm so people can get out. I got out of the business because there's too much liability.

  • Reply Guillermo Ortiz September 9, 2017 at 5:40 am

    So you just wanted to put on those shoes, didn't you?

  • Reply Omar Bakija November 4, 2017 at 6:14 pm

    yes it's fail safe is good mechanism

  • Reply Han Rahman November 5, 2017 at 2:40 pm

    i made it to 8k likes!

  • Reply Mark Smith November 6, 2017 at 1:14 am

    Really no such thing as fail-safe. Your doors fail and easily opened so the madman can escape.

  • Reply Chris Walker November 6, 2017 at 2:40 am

    My two favorite YouTubers in a CROSS OVER EPISODE!?!?

  • Reply Andrew Metzger November 6, 2017 at 4:52 am

    I've always heard it called fail-secure, but in most cases it is deadly. For instance, if those boots failed secure you could easily have been stuck upside down until the blood vessels in your head began to rupture.

  • Reply Lichtbaulb November 6, 2017 at 10:32 pm

    1:12 Colin looks bored.

  • Reply Nuclear Effect November 7, 2017 at 1:27 pm

    Tom's face is terrifying

  • Reply Joe Brown November 17, 2017 at 4:03 am

    My head hurts just watching this

  • Reply Simon Ruszczak December 1, 2017 at 12:27 pm

    Fail-deadly is used on self euthanizing machines.

  • Reply Frabjous December 15, 2017 at 7:06 pm

    I thought that was Boris Johnson from the thumbnail

  • Reply Collin December 16, 2017 at 4:07 am

    OMG YES!!!!!!!!!!!!!!!!

  • Reply aengus.chinn BISS December 21, 2017 at 8:59 am

    Anyone remember gadget geeks?

  • Reply RMoribayashi December 22, 2017 at 12:14 am

    I think it's about time for them to do another collab.

  • Reply Mike Page December 31, 2017 at 12:31 pm

    Not an invention. I worked on permanent electromagnets for lifting applications back in the 1980s. The trick was demagnetizing. These days that would be fairly easy but power electronics were an expensive dalliance back then, given the customer base.

  • Reply Da Kat February 4, 2018 at 9:45 am

    well now you can get information out of him

  • Reply Sephok February 15, 2018 at 8:31 am

    Interesting choice for a video about fail-safe things. If the magnets had failed (electromagnets, so if the batteries had suddenly died or a wire broken or something), wouldn't he have fallen straight on his head? Not so sure his neck could take that…

  • Reply RadioCATive March 16, 2018 at 12:18 pm

    I like how you see a bit of the behind-the-scenes with Tom's videos, like him mentioning them number of takes

  • Reply zetsevs March 26, 2018 at 4:54 am

    so I know you proubally trust the teck but put a bloody matress down under him while he does it or osmehting blow up even

  • Reply Daniel Holowaty April 16, 2018 at 4:21 pm

    Furze means farts in german and I cant stop laughing

  • Reply Cholloway01 April 17, 2018 at 10:05 pm

    why have i never seen this…..

  • Reply TheBetterGame April 18, 2018 at 3:34 pm

    We use fail safe brakes on all our big machines at work. They hurt. If the vehicle stalls or thinks it's rolling uncontrolled, the whole thing shuts down and the brakes automatically apply. You go from whatever speed you were doing, to zero in as fast as physics will allow.

  • Reply 0MindSwept0 April 23, 2018 at 7:23 am

    Ok den

  • Reply WanderingRandomer April 26, 2018 at 10:28 pm

    Just watching you dangling upside-down is giving me a headache!

  • Reply BertyFromDK April 28, 2018 at 6:40 pm

    Tom Scott, you never cease to amaze me 😀

  • Reply Adam Ladd April 29, 2018 at 10:41 pm

    The expanse has better mag boots

  • Reply FABULOG June 1, 2018 at 5:10 pm

    But was that something i might not have known?

  • Reply Caleb Dahlinger July 31, 2018 at 2:06 am

    can you do more stuff with colin?

  • Reply Dusekk ツ September 8, 2018 at 1:03 am

    colin is literally jonesy

  • Reply Voice Muted September 26, 2018 at 9:25 pm

    “Gravity is taken for granted, but when you are hanging upside down with some rope and a car battery, it’s the most important thing for you.” – George Washington

  • Reply yaggyplantationproductions October 14, 2018 at 4:01 pm


  • Reply Pseudo Nym December 16, 2018 at 7:40 pm

    Colin's BDSM quarter

  • Reply Maniac3020 February 26, 2019 at 6:53 am

    It's been years since I've seen this, and just found Colin's channel, and thought "Wait, haven't I seen Tom Scott doing this?"
    Turns out, I did! 😀

  • Reply Ginger Ninja February 28, 2019 at 2:05 pm

    Fantastic to see Colin on this channel!! So proud to be English! 🏴󠁧󠁢󠁥󠁮󠁧󠁿

  • Reply Woojin Jang March 4, 2019 at 6:39 pm

    My two English dads under one roof!

  • Reply kunal pahuja March 29, 2019 at 10:27 am

    All of that for a 2 minute video. * Applaud *

  • Reply greatdevourer36 April 25, 2019 at 6:36 pm

    “One take!”

  • Reply bert gernaat May 2, 2019 at 9:20 am

    Holy mozes, 2 of the most interressting Brits making great video's togehter. Keep up the cooperation. loving it.

  • Reply J G May 8, 2019 at 5:39 pm

    I'm not sure I understood that.

  • Reply 霊Radoncombe May 30, 2019 at 2:40 am

    You forgot the extra problem of breaking your spine after landing on your back and legs bent over onto your head.

  • Reply KeyStroke June 1, 2019 at 10:46 pm

    Would love to do this. It'd be great for me back

  • Reply Alan MR. July 17, 2019 at 3:29 am

    Tom Scott and Colinfurze in a video together:
    The most british video i've ever seen.

  • Reply brocky69 August 6, 2019 at 8:52 am


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