Many Swedish bridges are prepared for demolition with chambers inside to allow easy positioning of explosives.
Modern bridges have hollow girders, either concrete or steel, so getting a bridge to collapse isn’t difficult. Just need explosives …
Special people who are in any army in the world can easily blow up any bridge. But the decision to call or not is not made by them
I think that in some cases Ukrainian civilians took that initiative to block Russian vehicles from advancing
Now Kadyrov has one. He says he likes it and wants more.
All weapons captured by the Russians in Ukraine are transferred to the troops of Donetsk and Lugansk. I can fill up with photographs of their analysis of the trophy, incl. and NATO weapons.
Certainly. For 40 million Ukrainians, there were several tens or hundreds of people.
10 million people live in Sweden (less than in Moscow!). There must be several hundred crazy ones. But we judge Sweden not by them, but by a sane person with whom we communicate on these pages.
Not always easy as one would think.
Happens more often than engineers would like to admit.
H.P.
A few percent are crazy, so let’s say 5% or 10 million / 20 = half a million 
Not all of us have access to explosives though …
It is rumoured that the British end of the Channel Tunnel was built with hidden demolition charges installed to shut it off, just in case…
…and never underestimate the number of crazy people out there! 
There is an American joke which goes something like this:
One in four has some kind of mental disorder.
Check your three closest friends, if it isn’t one of Them
it is YOU
I think “prolonging the war” or to “stop the enemy advance” depends on which side of the bridge you stand.
But many have access to fertilizer and the other component.
Buying fertilizer in sufficient quantities requires having a farm.
A city dweller like me would have problems and raise suspicions …
Substitutions can be made. I’m just saying there are ways to get it done. A guy around the corner from us had about 10 17.8 liter propane tanks in his garage. He got angry with his wife and blew up himself and the garage.
“Big bada boom!”
Yeah, just ask the mayor of Beirut…
H.P.
Yup, but that was a whole sailer or importer storage,
I would get investigated by the police if I tried to by large amounts
Probably not the charges themselves but chambers in which to install them in the event they might be needed.
During WW2 the Canadian Pipe Mine (McNaughton Tube Tank Obstacle) was used in order to be able to render various roads, runways, etc., unusable at short notice while not having any impact on their normal operation. These were mostly removed after the war but a small number appear to have been forgotten about.
RNAS HMS Daedalus at Lee-on-Solent was closed in 1996 but the airfield was retained as a civil airport while the rest of the site was given over to (continuing) redevelopment. In 2006 twenty 60ft long mines were discovered during site clearance operations, then in 2017 they found another…
I understand the chambers for atomic demolition charges in German bridges were not in the over-water structure but in the eastern abutments, the idea being not only to take down the bridge but to leave a nasty large hot hole which would render infrastructure converging on the bridge useless to an invader as it would then be difficult to erect a temporary structure at the same location.
Regards,
M
There are only three main avenues through which the NorKs could invade South Korea. RoKs do indeed have explosives strategically set to collapse entire mountainsides to block their advance.
That said, I see little advantage to destroying the channel tunnel. For one thing, after cessation of hostilities, you’re going to have to rebuild the damned thing.
How about backing up a 40’ gravel truck a few hundred feet into the train tunnels, park another in front of it, and other in front of that. No vehicle is getting past that obstacle. No amount of tank gunnery will make it passable. A few soldiers at a time could trickle through - that would be ideal. Pick them off as they exit. Just like obstacles in twentieth century warfare - they’re meant to channel the enemy, not stop him.
Better to have some charges on the French side. Once they’re in the tunnel, seal their egress point.
As for the use of SADM’s - I became SADM qualified in 1983. There are certain depths a SADM has to be emplaced to get the desired cratering effect. We had charts to calculate the effects. But the main reason for burying the SADM was to create fracturing - a dam for instance. The drawback to burying the SADM as opposed to a ground burst was you’re throwing up a hell of a lot more radioactive fallout, not really creating a smoldering radioactive hole. And I think recent events have shown some folks would have no compunction about having their troops fill it with facine bundles and drive right on over it.