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Last week we had the worst weather ever in many years, over here in North France. Heavy showers, thunder & lightning, heavy wind, total apocalypse.

Water levels rose rapidly when I was on my way home, and all of a sudden I saw much too late that the road was blocked by a blown away willow. The road was covered by almost 30cm water and when I started to drive backwards I saw the driver behind me, trying to do his best to get his car started. Small car, soaked engine - I've got a small van, my engine could support even 30cm more but the water was really rising rapidly.

Moving the tree manually wasn't an option, the only way out was to cut it apart & force the passage.

But, the only tools I got in my van were metalworking tools. There was no saw, no axe or machete. Only hammers, drills, welders, grinders etc.

And my Hultafors survival knife. Always have that on you, or near you - it's not a survival knife for nothing.

So I grabbed a hammer, some duct tape & my knife and married them together in a kind of neo-apocalyptic zombiekiller.

I asked the other driver to attach his car to my van while I attacked that tree with my new tool.

I don't know if it was because the tool on itself was just great, or because I was soaked by adrenalin, but after 15 minutes the road was free and we managed to get out of the sink.

Thank you, Hultafors & hammer. And duct tape.

Urban survival. I didn't see that coming.

I won't learn you how to fix a hammer to a knife with tape, in this I'ble, but I will show you how to upgrade your knife into a real hacking beast.

Step 1: My Divine Hammer

This project can be resumed in 'hacking a hammer', in fact - in this case a cheap 'Magnusson' carpenters hammer, whatever.

Cut off the tip & make a groove in what's left of it. Angle grinder, you need it.

This groove will block the blade and keep it straight. Without works, but the blade will likely move sidewards and all you risk is demolishing your knife.

Width: at least the same as the thickness of your knife.

Depth: 10mm is okay.

Grind the edges & you're done.

5 minutes. Easy & brutal.

<p>This is not a safe idea. Knives are harder and therefore more brittle than axes. Knives are ground thinner than axes to do the type of work they are meant to do. Axes are not as hard as knives so they will absorb shock rather than be damaged by it. Axes are thicker than knives so their edges are less likely to chip.</p><p>Putting weight behind a knife's thinner and more brittle edge to convert it to an axe is unwise and will eventually lead to the edge fracturing, and possibly causing an injury. Better to carry a hatchet for safety and efficiency instead. Very imaginative and creative, to be sure. I'm sure you'll have lots of excellent ideas to share in the future.</p>
<p>American Hero.</p>
<p>And his sidekick, Bayonax!</p>
<p>Ridiculous! Asinine! Cumbersome! and...and... I'm going to make that tonight...</p>
<p>I agree totally! This shouldn't have been invented at all! </p><p>But now you see what the instinct to survive - and save your car - can do with a persons mind...</p><p>Good luck with not building this!</p>
<p>HAHAHAHA! I will, thanks mate!</p>
<p>Do you know axes?</p>
<p>Axes? Oh yeah, I know him! He's totally crazy and thus a good friend of mine. We yell to the open see very often and throw emty beer bottles to alien warships. Axes is just one piece of fun. You know him too?</p>
<p>did you read it at all</p>
<p>i kinda want to see this done with a mini sledge and a big bush knife or a full sledge and a machete </p>
<p>Since you had the tools to grind that hammer down, why not just grind an edge on the hammer? </p>
<p>The grinded hammer is just an upgrade of the initial idea. Like I wrote, I just fixed my knife to a hammer with duct tape to get the job done, and it worked perfect as well. Less elegant, but functional.</p><p>For what its worth: this configuration has a large cutting edge. Even if you should manage to sharpen one side of the hammer, it still would have a very small cutting edge and thus it would take an eternity to do something decent with it. </p><p>Better should be to forge one side of the hammer. But, this would take much more than the minute I needed to do the duct tape thing. And it would have required a forge, also...</p>
Yes, I saw in one of your pictures on one limb how it worked perfectly.<br><br>
<p>Shadow catcher</p><p>Clever, but if you have to buy an inexpensive hammer to modify, why not just buy a good hatchet or camp ax and be done with it. That way you still have your ax, hammer and you don't ruin a good knife.</p>
<p>You're probably a lot better informed than me, but where did you get that I ruined my knife?!</p>
Wasn't trying to be snarky or anything. It's really a clever idea. Didn't think you ruined your knife. Meant that there is a chance of damaging the knife. (If continually used in this fashion) I know that type of knife is meant to be a survival tool and you needed something then, but for most people, I think having a good hand axe would be more practical.
<p>No worries Dennis! Maybe you could damage the knife by hitting directly on the back, but in this configuration the back is in direct contact with the hammer and so there's very little chance of ruing it. </p><p>Know that the start of this all was an emergency situation: getting out of there asap. No rules, there were only points to gain with efficiency. </p><p>I agree though, just a small axe would have made a difference froim the start, but since I had all but that it was pumping of drowning. </p><p>So far so good, a decent knife &amp; some out off the box thinking do can save your life. </p><p>Cheers!</p>
<p>Use a rock on a stick for the hammer.</p>
<p>Good ible. I usually carry a knife, but almost never a hatchet or an axe. In case SHTF, could just tie it to a stick, and make like you did, hell, could even make a spear if needed. But yeah, this is cool, never would have thought of chopping a tree with a knife.</p>
<p>I've always been a great fan of these small short axes you see in most of my Ibles, but I didn't have one when I needed it really badly. So I improvised, and came up with a new tool. And a good story ;)</p>
<p>&quot;Thor meets bushcraft&quot; like it. I like the expediency of the design. Kudos. Just an FYI, there was another alien granted the power of Thor, named Beta Ray Bill. He possessed a hybrid Axe/Hammer called &quot;Stormbreaker&quot;. Fairly appropriate name for your Bayonax design also considering yours originated because of a storm. Thought this was a cool tidbit.</p>
<p>Haha, since we're talking cartoons; this reminds me of &quot;Asterix and the Vikings&quot;. But for real, the other surviving Celt cross the channel; Bear Grylls, could probably sell this in stores.</p>
<p>Awesome! It litterally broke me through the storm, thanx!</p>
<p>Since you had the tools to grind that hammer down, why not just grind an edge on the hammer? </p>
<p>This is my kind of tool!</p>
<p>Doesn't surprise me at all!</p>
<p>A rock on a stick could also work if you don't have tools with you.</p>
<p>I don't see this ending well.</p>
<p>Hahahahaha</p>
<p>I have a well used butchers cleaver for this situation. Could be I took cooking classes and needed one, or that my Father in Law (retired butcher) gave me a &quot;spent&quot; cleaver, that is, it was sharpened so much it is 1/4 its original size..... he used it to prune trees and while I will use it to wack a bone here and there, it does wonders on trees. But don't miss, or sparks and bone chips, (your own) will fly!</p><p>I can see this in emergency, but eventually it will destroy the knife. So while I thought this silly at forst, it actually is/certainly was, useful.</p><p>If you have no grinder use a claw hammer, already has the notch. Then again if I were home I have axes and hatchets and of course my ambidextrous meat cleaver!</p><p>cheers</p>
<p>It looks like against zombies :D</p>
I'm a welder and I love the part of the story with you having your van loaded with welders and grinders just as much as this awesome tool that very likely saved your life! Good choice, very resourceful, almost MacGyver! Ok...very much as MacGyver!
<p>Thanx a lot mate! Most hilarious of all was the look in the eyes of the guy when I headed towards his car with the zombiekiller still in my hands... ;)</p>
ROFL! That's an image that I can't stop laughing at!
<p>Good story with a good outcome. I really like the ingenuity of this build. Well done my friend.</p>
<p>Thank you - 30 minutes later &amp; the story would have been different. Whatever, I've been amphibic!</p>
I am glad you saved your van and the car behind but ..... Knives ..... I am very disappointed and, living in France, I thought you might be more patriotic. By far the best and cheapest knives ever made are by opin opinel no. 12 is a knife that you can actually sharpen and even shave with. It's proper carbon steel, and rusts to prove it! End of rant !
<p>I was about to look up the Grovnav, but decided to read the comments before diving off the deepend. I'm glad a did. A modern knife with proper carbon steel, be still my beating heart. Now I have another rabbit hole to dive down. If only I can find a cheap importer...</p>
<p>Here's where I got mine: </p><p>https://www.lamnia.com/en/</p>
<p>You know, I'm an imported product in France and thus certainly not a French patriot. In contrary, I took a piece of land back that they stole from Belgium many years ago. Flemish soil here, I'm pissing in every corner every day! </p><p>Good - second - choice that Opinel ;) Was one of my first knives but in my hands it became too unstable and started rusting faster than I liked... </p>
Absolute genius! They say ingenuity is born out of necessity, I'd say you nailed it! Head ible!
<p>Thanx a lot! It was a hell of a ride but definitely one to remember - wish I had a dashcam ;)</p>
Awesome!
<p>Thanx!</p>
My iPad always crashes whenever I try to publish an instructible did this happen to any body else
<p>My grandma is also farting too loud. Anyone suggestions?</p>

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Bio: I made a beer mug with only a knife & a hatchet. I think that says a lot about me.
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