The art of defusing a second world war bomb

My aunt lives in Hamm, Germany. It used to be a massive rail road hub and allies bombed the f* out it. The old church sitting middle of the town still carries the scars of bombing. Few years ago, during the renovation of the shopping mall, construction crew found unexploded American 500 lbs bomb in the ground. City had to evacuate a lot of people. Throughout years, there were multiple other incidents with UXO in Hamm, that I can recall. I still wonder how the 500 pound bomb been sitting in the ground so many years, right in the center of the town, right by the shopping mall and no one noticed.

• dingensundso · 4 hours ago

  As a German living in Berlin it's still pretty normal that once in a while WW2 bombs are found during construction. Heavy bombs that didn't explode probably penetrated the ground quite a bit so when rebuilding it was probably just easier to just leave them there. That's just a guess. There are also still bombs and grenades in the rivers. There are some magnet fishing YouTube channels where you can occasionally see them pulling up stuff like that.

  • msdz · 4 hours ago

    > so when rebuilding it was probably just easier to just leave them there. That's just a guess. My take (equally guessed): Among the literal rubble spread all over the cities, people constructing everything back up with whatever means possible couldn’t even recognize a mostly buried object as a bomb (instead of just more scrap from a collapsed building). So less of an active decision to not deal with it, rather one out of necessity and/or not knowing about them, perhaps?

    • GolfPopper · 3 hours ago

      My own guess is that a fair number of them just buried themselves. While I don't have all the relevant facts at hand, per the US Naval Institute, a 550 lb bomb dropped form 20,000 feet would hit the ground at 880 feet per second [1]. If my rusty mind is correct, that would be around 9 megajoules, while feels like it ought to be enough to bury a bomb pretty well in any sort of yielding soil. 1. https://www.usni.org/magazines/proceedings/1941/december/how...

      • usrusr · 2 hours ago

        Have another bomb in the vicinity that did not fail and there will be absolutely no visible indication at all that something penetrated the ground. I might be imagining this but I think that I have seen a report about some systematic effort to trace bomb dropping patterns in aerial images of the aftermath to find gaps in the pattern where something did not go off. But no idea how early or late after the war that happened (if it did happen). And those patterns will only show up for smaller bombs dropped in quantity, not for the big ones.

• bell-cot · 3 hours ago

  > I still wonder how... A 500 lbs bomb falling from altitude can bury itself a fair ways in soil. Most of its fellow bombs will have good fuses - and with the mess they make, it would take some careful excavation in just the right spot to find the dud bomb. (Or, maybe it fell in a patch of overgrown brush in a park, or in a river, or a farmer's pond, or ...) And with the scale at which Germany was bombed in WWII, there was nothing remotely resembling the resources to carefully excavate all the myriad square miles where dud bombs might have fallen. Either during the war, or after.

• scyzoryk_xyz · 2 hours ago

  True further east, here in former Germany, now Poland. Especially throughout the construction and investment boom that's been happening since 00's. Just last year my neighborhood was evacuated. Unexploded Soviet ordnance - insane how much of it was dropped and buried in the rubble to this day. You're right though - weird to think that nobody would notice, but so much Europe was turned to rubble at that time. These things got turned to unrecognizable rusty mush after a few decades. Pretty sure it's also an excuse to keep the bomb squad and evacuation procedures in practice. These things are pretty routine, there is no fear or panic. IThey just diffuse and take the thing away to some military range to dispose of it.

  • mrlonglong · 1 hour ago

    Defuse. Diffuse has a different meaning.

  • lukan · 1 hour ago

    "Pretty sure it's also an excuse to keep the bomb squad and evacuation procedures in practice." Definitely not in this eastern part of germany where I live. Every major construction needs to check for bombs, but it also happens randomly that a excavator finds a bomb. There were just a looot of bombs dropped. (And they don't always move it, often it is too rusty also to defuse and then controlled explosion if the surroundings allow it (they use lots of water bags on top, witnessed it once))

• 21asdffdsa12 · 1 hour ago

  10 - 20 % never exploded, and those exploding buried the unexploded ordnance. https://www.alamy.com/stock-photo-bomb-craters-after-allied-... Those areas where moon craters at the end of the war. But by then logistics where decentralized, all those last days last ditch products, where made in underground facilities or small village smith factories. Effectively they bombed a bomb disposal pit..

• gmueckl · 21 minutes ago

  Germany deals with multiple thousands of WW2 bombs each year to this day.

It’s worth tracking down a UK miniseries called “Danger UXB” that was made in the early eighties. Not sure how accurate the actual on screen dry ice and cut the red wire stuff was but as a character study of the men involved and the danger they were constantly in it was compelling viewing. Heartbreaking too. One of my favourite TV shows

• robk · 2 hours ago

  Whoh 1979! Downloading now, thanks for the rec

  • iJohnDoe · 1 hour ago

    Downloading from where?

    • coldcity_again · 44 minutes ago

      https://archive.org/details/danger-uxb-1979 A very worthwhile watch. I come back to it every few years.

• helsinkiandrew · 1 hour ago

  While searching for that I discovered "U.X.B." a 1942 UK bomb disposal training film that is surprisingly thorough in description of the types of German bombs, fuses, and how to report UXBs (during WW2) https://www.youtube.com/watch?v=vhpmXeCp6sc

• weinzierl · 1 hour ago

  Not directly bomb related but another good UK series from the 80s that gives a good impression of how so many bombs ended up undiscovered is "The Machine Gunners" . My parents were around the age of the children in the series during WW II in Germany and what they recounted matched how the children experienced the time pretty well.

• rjmunro · 4 minutes ago

  James May did a bit about it in one of his shows https://www.youtube.com/watch?v=nnQ_pS4T0vI

Having to analyze 80 year old bombing records during new constructions adds to the long list of downsides of wars

• bell-cot · 2 hours ago

  Even if every scrap of WWII bombing records had been kept, preserved, and properly indexed for that - WWII bomber navigation was nothing near accurate enough for it to be very useful. I'd figure the builders just go with their local knowledge - of how many WWII bombs have turned up, and where, and things to watch out for. BTW, Europe has similar problems with dud artillery shells, old minefields, etc. And it's not just WWII, nor just Germany. The most infamous is probably https://en.wikipedia.org/wiki/Red_Zone_(World_War_I)

  • AntonTrollback · 58 minutes ago

    Interesting. Thanks for the link. Imagine a place like Afghanistan. I assume neither USSR nor USA records are accessible for the people there. Their landmine issue is just too sad https://www.dailymail.com/news/article-3205978/Pictured-harr...

Yes, that’s pretty normal here. After the war ended, a lot of it was disposed of by the public, and there’s still much more waiting to be recovered from rivers and ponds. Before anything can be built, it must be verified that there is no longer any ammunition in the ground. That’s why construction projects here sometimes take longer. But this profession has a future. And you can only make a mistake once. Translated with DeepL.com (free version)

France has a much worse disposal problem. They're still cleaning up unexploded WWI artillery shells. That's been going on steadily for a century, and there are still large keep-out zones. Estimated completion in another century.

• 21asdffdsa12 · 1 hour ago

  Surely, these rouge zones can be turned back into useable areas- after the bombs are defused. If there was lots of lead, then the produce from those areas would be poisonous though..

  • folbec · 1 hour ago

    Lead, mercury, arsenic... Some places will never be settled again. https://en.wikipedia.org/wiki/Zone_rouge (to top that some ammo dumps were simply dumped in holes in the ground at the end of the war and are slowly diffusing there toxic compounds via under ground rivers)

    • 21asdffdsa12 · 59 minutes ago

      How do we as a species communicate for the next ten thousand years, that these places are poisoned and dangerous? The answer- statues of Goatse..

      • pjc50 · 26 minutes ago

        You may be riffing on it already, but for those who aren't familiar: https://en.wikipedia.org/wiki/Long-term_nuclear_waste_warnin... ("this is not a place of honor" has already become a meme that has escaped containment)

I've seen one of those little robots before. My friend found what looked like a hand grenade while breaking up concrete/brick work in a house renovation. We called the police and fortunately we live right near to a Royal Engineers base with a bomb disposal team. They came out in their van and brought out the robot to have a look then picked it up and took it back with them in the van.

I read this article yesterday and it’s the latest in a long line of really enjoyable real world stories from The Guardian lately. In a world where it seems harder and harder to get people to engage with long-form content rather than just clickbait, it’s nice to see some organisations still publishing good quality articles.

They said the last person to be killed by a WW2 bomb probably hasn't been born yet.

And the mother of all unexploded WW2 ordance is the SS Richard Montgomery . 1.4kt of explosive sat in the Thames Eastury, 35 miles down river from central London, that nobody knows how to get rid of. "it was determined that if the wreck of Richard Montgomery exploded, it would throw a 300 metres (980 feet)-wide column of water and debris nearly 3,000 metres (9,800 feet) into the air and generate a wave 5 metres (16 feet) high. Almost every window in Sheerness (population circa 20,000) would be broken and buildings would be damaged by the blast." https://en.wikipedia.org/wiki/SS_Richard_Montgomery

• TeMPOraL · 1 hour ago

  Isn't that a kind of thing you just have to bite the bullet and deal with directly, because waiting only makes dealing with it more expensive with time? Just evacuate the people and blow it up, accepting that it'll inconvenience a lot of folks and the national budget even more, but will also briefly revitalize the local economy, as every contractor there is will maximize the opportunity to suck out the funds set aside for repairing buildings damaged in the explosion - and make sure to record the disposal itself from every possible angle, with most expensive cameras government can buy, as selling clips of it to the media industry would be a licensing goldmine and recoup some of the costs. Hell, turn it into a spectator event, and tourists coming to see it may just pay for the whole thing.

  • kakacik · 34 minutes ago

    If they can spend 5 millions just for mast removal, I am pretty sure they could build some rough reinforced concrete dome / something similar all around it (15m depth ain't something impossible to build on) that could absorb most of the blast. Say 50 million budget. Of course red tape, bureaucracy and just laziness/incompetence of state bureaucrats would make such budget balloon and drag for a decade or two, but it should be doable.

    • manarth · 2 minutes ago

      Water is a great blast-absorbent material. If 15m of water can't contain the blast, adding concrete or similar is more likely to add solid projectiles to the explosion than diminish the force of the blast.

  • petesergeant · 13 minutes ago

    Yes, but why be the politician or civil servant responsible for dealing with it when it will most assuredly be someone else's problem in a few years? The political upside of getting it done is low, and the risk and cost are high.

• throwawayffffas · 45 minutes ago

  Hm, reminds me of the 2020 beirut explosion. It was 2.7 kt of ammonium nitrate.

Wonderful article. Reminds me of my experience scuba diving in Croatia. My group and I were doing a seabed waste-collection dive, and part of it was an obligatory training on ordnance. The sea there has had a fair few wars and conflicts. I remember being astounded by how the water "amplifies" the explosions - so while a hand grenade blast is very dangerous on the surface, under the sea it becomes far more horrific prospect, due to the water transferring the blast more efficiently. Nerve wracking stuff, when you're thinking about diving down there - imagining that a bomb dozens of meters away could pulverize you. Still pretty rare, thankfully. I applaud the diver bomb disposal squads - some of the most dangerous work there is.

> Bomb disposal is a dangerous job but, Hambley told me: “Knowledge dispels fear.” In some places bomb disposal technicians are only allowed on the job for a limited time. Then they move to the "back seat" and consult or assist from far away. Because with years of knowledge and experience comes the kind of confidence that doesn't apply well to unknown devices rusting in the ground for close to a century. Misplaced confidence is dangerous. Does it work the same way in the UK?

We got an alarm delivered via phone here in Berlin a few weeks ago notifying of an evacuation zone near our office where they had found a WW II bomb. Big enough to evacuate everyone in a 500 meter (I think) radius. Our office was outside of the evacuation zone. It was slightly funny because I configured my phone to use a weird chipmunk voice to read stuff out loud apparently (not a feature I use) and it actually started reading out the message. Big WTF. moment until I figured out. Grabbed my attention though and it was the first real alarm I've received. We get a practice alarm message every few months.